diff --git a/.github/ISSUE_TEMPLATE/1_bug_report.yml b/.github/ISSUE_TEMPLATE/1_bug_report.yml
index d8e1c50..6201e46 100644
--- a/.github/ISSUE_TEMPLATE/1_bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/1_bug_report.yml
@@ -23,7 +23,7 @@ body:
     attributes:
       label: IconCaptcha version
       description: Please specify the version of the package that you are using.
-      placeholder: "e.g. 4.0.3"
+      placeholder: "e.g. 4.0.4"
     validations:
       required: true
   - type: input
@@ -31,7 +31,7 @@ body:
     attributes:
       label: PHP version
       description: Please specify the version of PHP you are using.
-      placeholder: e.g. 8.2.0
+      placeholder: e.g. 8.4.0
     validations:
       required: true
   - type: dropdown
diff --git a/.github/ISSUE_TEMPLATE/2_blank_issue.yml b/.github/ISSUE_TEMPLATE/2_blank_issue.yml
index 61da860..1ca415f 100644
--- a/.github/ISSUE_TEMPLATE/2_blank_issue.yml
+++ b/.github/ISSUE_TEMPLATE/2_blank_issue.yml
@@ -12,7 +12,7 @@ body:
     attributes:
       label: IconCaptcha version
       description: Please specify the version of the package that you are using.
-      placeholder: "e.g. 4.0.3"
+      placeholder: "e.g. 4.0.4"
     validations:
       required: true
   - type: input
@@ -20,7 +20,7 @@ body:
     attributes:
       label: PHP version
       description: Please specify the version of PHP you are using.
-      placeholder: e.g. 8.2.0
+      placeholder: e.g. 8.4.0
     validations:
       required: true
   - type: textarea
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f37e85a..6899ea8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 All notable changes will be documented in this file. Only changes starting at IconCaptcha 2.0.2 have been recorded.
 
+## 4.0.4 - January 23, 2025
+Release: [View tag 4.0.4](https://github.com/fabianwennink/IconCaptcha-PHP/releases/tag/4.0.4)
+
+### Fixed
+- Fixed a compatibility issue with PHP 8.4 caused by a deprecation warning for "implicitly marked nullable parameters", which was breaking the code.
+
+For a full list of commits and changes, please refer to the [full commit changelog](https://github.com/fabianwennink/IconCaptcha-PHP/compare/4.0.3...4.0.4).
+
 ## 4.0.3 - Dec 19, 2023
 Release: [View tag 4.0.3](https://github.com/fabianwennink/IconCaptcha-PHP/releases/tag/4.0.3)
 
diff --git a/README.md b/README.md
index 6df9a68..593ec23 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@
 </p>
 
 <p align="center">
-    <a href="https://github.com/fabianwennink/IconCaptcha-PHP/releases"><img src="https://img.shields.io/badge/version-4.0.3-orange.svg?style=flat-square" alt="Version" /></a>
+    <a href="https://github.com/fabianwennink/IconCaptcha-PHP/releases"><img src="https://img.shields.io/badge/version-4.0.4-orange.svg?style=flat-square" alt="Version" /></a>
     <a href="https://packagist.org/packages/fabianwennink/iconcaptcha"><img src="https://img.shields.io/packagist/v/fabianwennink/iconcaptcha.svg?style=flat-square" alt="Latest Version on Packagist" /></a>
     <a href="https://fabianwennink.nl/projects/IconCaptcha/license"><img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" alt="License" /></a>
     <a href="https://paypal.me/nlgamevideosnl"><img src="https://img.shields.io/badge/support-PayPal-lightblue.svg?style=flat-square" alt="Support via PayPal" /></a>
diff --git a/assets/client/css/iconcaptcha.min.css b/assets/client/css/iconcaptcha.min.css
index 29d5dee..a1af9ef 100644
--- a/assets/client/css/iconcaptcha.min.css
+++ b/assets/client/css/iconcaptcha.min.css
@@ -1,2 +1,2 @@
-/*! IconCaptcha v4.0.1 | (c) 2023, Fabian Wennink (fabianwennink.nl) | fabianwennink.nl/projects/IconCaptcha-Widget/license */
-.iconcaptcha-widget{position:relative;max-width:330px;min-height:50px;width:99%;height:auto;border-radius:8px;font-family:inherit;text-shadow:none;line-height:1;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}.iconcaptcha-widget a{text-decoration:none}.iconcaptcha-widget.iconcaptcha-init{-webkit-transition:background 150ms linear;transition:background 150ms linear}.iconcaptcha-widget.iconcaptcha-init:hover{-webkit-transition:background 150ms linear;transition:background 150ms linear}.iconcaptcha-widget.iconcaptcha-init:hover .iconcaptcha-modal__body-circle{opacity:.75;-webkit-transition:opacity .1s linear;transition:opacity .1s linear}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body{cursor:pointer}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-circle{width:28px;height:28px;border-radius:100%;border:6px solid #52b3d9;position:absolute;top:13px;left:15px;-webkit-transition:opacity .1s linear;transition:opacity .1s linear;-webkit-animation:captcha-breathing 5s infinite linear;animation:captcha-breathing 5s infinite linear}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-circle--speed{-webkit-animation-duration:2s;animation-duration:2s}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-title,.iconcaptcha-widget.iconcaptcha-success .iconcaptcha-modal__body-title{font-size:15px;font-weight:bold;top:19px;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:20px;padding-left:60px}.iconcaptcha-widget .iconcaptcha-modal{width:100%;display:block}.iconcaptcha-widget .iconcaptcha-modal__header{height:auto;padding:0 10px;display:block}.iconcaptcha-widget .iconcaptcha-modal__header span{padding:6px 0;display:block;text-align:center;font-size:11px;line-height:14px;font-weight:bold;cursor:default}.iconcaptcha-widget .iconcaptcha-modal__header span::-moz-selection{background:none !important}.iconcaptcha-widget .iconcaptcha-modal__header 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#404040}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header{border-bottom:2px solid #404040}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header span{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__body-subtitle{color:#b1b1b1}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer{color:#a7a7a7;border-top:2px solid #404040;padding-top:6px;padding-bottom:5px}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer>span a{color:#fff;text-transform:uppercase;font-weight:bold}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer>span a:hover{color:#f0f0f0}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-init:hover{background:#f1f1f1}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-init .iconcaptcha-modal__body-title{color:#464646}.iconcaptcha-widget.iconcaptcha-theme-light .iconcaptcha-modal__header span{color:#1d1d1d}.iconcaptcha-widget.iconcaptcha-theme-light .iconcaptcha-modal__body-info a{color:#afafaf}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-success .iconcaptcha-modal__body-checkmark svg{stroke:#5bd25b}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-success .iconcaptcha-modal__body-title{color:#5bd25b}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-error .iconcaptcha-modal__body-title{color:#ef5858}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-init:hover{background:#454545}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-init .iconcaptcha-modal__body-title{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header span{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__body-info a{color:#b1b1b1}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-success .iconcaptcha-modal__body-checkmark svg{stroke:#93d293}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-success .iconcaptcha-modal__body-title{color:#93d293}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-error .iconcaptcha-modal__body-title{color:#ef5858}.iconcaptcha-widget.iconcaptcha-success,.iconcaptcha-widget.iconcaptcha-error{cursor:default}.iconcaptcha-widget *{-webkit-box-sizing:border-box;box-sizing:border-box;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}.iconcaptcha-widget *::-moz-selection{background:none !important}.iconcaptcha-widget *::selection{background:none !important}.iconcaptcha-widget *::-moz-selection{background:none !important}@-webkit-keyframes captcha-breathing{0%,100%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}25%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}50%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}75%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}}@keyframes captcha-breathing{0%,100%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}25%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}50%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}75%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}}
\ No newline at end of file
+/*! IconCaptcha v4.0.2 | (c) 2017-2025, Fabian Wennink (fabianwennink.nl) | fabianwennink.nl/projects/IconCaptcha-Widget/license */
+.iconcaptcha-widget{position:relative;max-width:330px;min-height:50px;width:99%;height:auto;border-radius:8px;font-family:inherit;text-shadow:none;line-height:1;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}.iconcaptcha-widget a{text-decoration:none}.iconcaptcha-widget.iconcaptcha-init{-webkit-transition:background 150ms linear;transition:background 150ms linear}.iconcaptcha-widget.iconcaptcha-init:hover{-webkit-transition:background 150ms linear;transition:background 150ms linear}.iconcaptcha-widget.iconcaptcha-init:hover .iconcaptcha-modal__body-circle{opacity:.75;-webkit-transition:opacity .1s linear;transition:opacity .1s linear}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body{cursor:pointer}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-circle{width:28px;height:28px;border-radius:100%;border:6px solid #52b3d9;position:absolute;top:13px;left:15px;-webkit-transition:opacity .1s linear;transition:opacity .1s linear;-webkit-animation:captcha-breathing 5s infinite linear;animation:captcha-breathing 5s infinite linear}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-circle--speed{-webkit-animation-duration:2s;animation-duration:2s}.iconcaptcha-widget.iconcaptcha-init .iconcaptcha-modal__body-title,.iconcaptcha-widget.iconcaptcha-success .iconcaptcha-modal__body-title{font-size:15px;font-weight:bold;top:19px;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:20px;padding-left:60px}.iconcaptcha-widget .iconcaptcha-modal{width:100%;display:block}.iconcaptcha-widget .iconcaptcha-modal__header{height:auto;padding:0 10px;display:block}.iconcaptcha-widget .iconcaptcha-modal__header span{padding:6px 0;display:block;text-align:center;font-size:11px;line-height:14px;font-weight:bold;cursor:default}.iconcaptcha-widget .iconcaptcha-modal__header span::-moz-selection{background:none !important}.iconcaptcha-widget .iconcaptcha-modal__header span::selection{background:none !important}.iconcaptcha-widget .iconcaptcha-modal__header span::-moz-selection{background:none !important}.iconcaptcha-widget .iconcaptcha-modal__body{display:block;overflow:hidden;position:relative;height:50px;padding:2px 4px;text-align:center;-webkit-box-align:center;-webkit-box-pack:center;-webkit-box-sizing:initial;box-sizing:initial}.iconcaptcha-widget .iconcaptcha-modal__body-title{font-size:20px;font-weight:700;text-transform:uppercase;display:inline-block;width:100%;position:absolute;left:0;right:0;top:8px}.iconcaptcha-widget .iconcaptcha-modal__body-subtitle{font-size:12px;display:inline-block;width:100%;position:absolute;left:0;right:0;top:35px}.iconcaptcha-widget .iconcaptcha-modal__body-icons{position:relative;height:50px;background-repeat:no-repeat;background-position:50% 50%;z-index:1}.iconcaptcha-widget .iconcaptcha-modal__body-selection{position:absolute;left:0;top:2px;bottom:0;right:0;margin:2px 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#404040}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header{border-bottom:2px solid #404040}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header span{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__body-subtitle{color:#b1b1b1}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer{color:#a7a7a7;border-top:2px solid #404040;padding-top:6px;padding-bottom:5px}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer>span a{color:#fff;text-transform:uppercase;font-weight:bold}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__footer>span a:hover{color:#f0f0f0}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-init:hover{background:#f1f1f1}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-init .iconcaptcha-modal__body-title{color:#464646}.iconcaptcha-widget.iconcaptcha-theme-light .iconcaptcha-modal__header span{color:#1d1d1d}.iconcaptcha-widget.iconcaptcha-theme-light .iconcaptcha-modal__body-info a{color:#afafaf}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-success .iconcaptcha-modal__body-checkmark svg{stroke:#5bd25b}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-success .iconcaptcha-modal__body-title{color:#5bd25b}.iconcaptcha-widget.iconcaptcha-theme-light.iconcaptcha-error .iconcaptcha-modal__body-title{color:#ef5858}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-init:hover{background:#454545}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-init .iconcaptcha-modal__body-title{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__header span{color:#dadada}.iconcaptcha-widget.iconcaptcha-theme-dark .iconcaptcha-modal__body-info a{color:#b1b1b1}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-success .iconcaptcha-modal__body-checkmark svg{stroke:#93d293}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-success .iconcaptcha-modal__body-title{color:#93d293}.iconcaptcha-widget.iconcaptcha-theme-dark.iconcaptcha-error .iconcaptcha-modal__body-title{color:#ef5858}.iconcaptcha-widget.iconcaptcha-success,.iconcaptcha-widget.iconcaptcha-error{cursor:default}.iconcaptcha-widget *{-webkit-box-sizing:border-box;box-sizing:border-box;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}.iconcaptcha-widget *::-moz-selection{background:none !important}.iconcaptcha-widget *::selection{background:none !important}.iconcaptcha-widget *::-moz-selection{background:none !important}@-webkit-keyframes captcha-breathing{0%,100%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}25%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}50%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}75%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}}@keyframes captcha-breathing{0%,100%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}25%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}50%{-webkit-transform:scale(1) translateZ(0);transform:scale(1) translateZ(0);border-color:#52b3d9}75%{-webkit-transform:scale(0.8) translateZ(0);transform:scale(0.8) translateZ(0);border-color:#41a2c7}}
\ No newline at end of file
diff --git a/assets/client/js/iconcaptcha.min.js b/assets/client/js/iconcaptcha.min.js
index ab17013..71dd07c 100644
--- a/assets/client/js/iconcaptcha.min.js
+++ b/assets/client/js/iconcaptcha.min.js
@@ -1,2 +1,2 @@
-/*! IconCaptcha v4.0.1 | (c) 2023, Fabian Wennink (fabianwennink.nl) | fabianwennink.nl/projects/IconCaptcha-Widget/license */
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Cannot use 'reset' yet."):a(this.instances,function(e){void 0!==t&&e.id!==t||null!=e&&e.reset()}),this},e.bind=function(t,n){return void 0===this.instances?console.error("IconCaptcha has not yet been initialized. Cannot use 'bind' yet."):a(this.instances,function(e){e.element.addEventListener(t,n)}),this};var n=function(e,t,n){if(void 0===e.instances||!t.some(function(e){return null!==e.querySelector(".iconcaptcha-modal")})){void 0===e.instances&&(e.instances={});var a=IconCaptchaPolyfills.extend({},r,n||{}),o=Object.values(e.instances).length;e.instances[o]=[];for(var i=0;i<t.length;i++)e.instances[o].push(l(t[i],i,a));return c(e.instances[o])}console.error("IconCaptcha has already been initialized on one or more elements in this list:",t)},a=function(e,t){for(var n=0,a=Object.values(e);n<a.length;n++)for(var o=a[n],i=0,r=Object.values(o);i<r.length;i++)t(r[i])},c=function(o){var e={reset:function(e){var t,n=_createForOfIteratorHelper(o);try{for(n.s();!(t=n.n()).done;){var a=t.value;void 0!==e&&a.id!==e||null!=a&&a.reset()}}catch(e){n.e(e)}finally{n.f()}return this},bind:function(e,t){var n,a=_createForOfIteratorHelper(o);try{for(a.s();!(n=a.n()).done;)n.value.element.addEventListener(e,t)}catch(e){a.e(e)}finally{a.f()}return this}};return e},l=function(e,t,i){var r,n,c,a,o,l=e,s=!1,d=null,u=0,p=!1,f=0,h=!1,y=!1,v=Date.now();if(i.general.endpoint)return m(),{id:c,element:e,reset:function(){a=void 0,O(),y=h=p=s=!1,IconCaptchaPolyfills.trigger(l,"reset",{captchaId:c}),m()}};function m(){c=c||function(){for(var e,t="",n=0;n<32;n++)8!==n&&12!==n&&16!==n&&20!==n||(t+="-"),e=16*Math.random()|0,t+=(12===n?4:16===n?3&e|8:e).toString(16);return t}(),o=null===(t=document.querySelector('input[name="_iconcaptcha-token"]'))||void 0===t?void 0:t.value;var e,t,n=l.getAttribute("data-theme")||"light";if(l.classList.add("iconcaptcha-theme-"+n),i.general.fontFamily&&(l.style.fontFamily=i.general.fontFamily),!s&&i.security.displayInitialMessage)return i.security.displayInitialMessage&&l.addEventListener("click",function(e){s||e.target instanceof HTMLAnchorElement||(s=!0,l.querySelector(".iconcaptcha-modal__body-circle").style.animationDuration="2s",l.querySelector(".iconcaptcha-modal__body-title").innerText=i.locale.initialization.loading,setTimeout(function(){l.classList.remove("iconcaptcha-init"),m()},i.security.initializationDelay))}),e=["<div class='iconcaptcha-modal'>","<div class='iconcaptcha-modal__body'>","<div class='iconcaptcha-modal__body-circle'></div>","<div class='iconcaptcha-modal__body-title'>".concat(i.locale.initialization.verify,"</div>"),"</div>","</div>"],t=i.general.showCredits?"":"display: none",e.splice(4,0,"<div class='iconcaptcha-modal__body-info' style='".concat(t,"'>"),"<a href='".concat(q,"' target='_blank' rel='follow' title='").concat(k,"'>IconCaptcha &copy;</a>"),"</div>"),l.classList.add("iconcaptcha-init"),l.classList.remove("iconcaptcha-error","iconcaptcha-success"),void(l.innerHTML=e.join(""));p||function(){var e=[];e.push("<div class='iconcaptcha-modal'>","<div class='iconcaptcha-modal__header'>","<span>".concat(i.locale.header,"</span>"),"</div>","<div class='iconcaptcha-modal__body'>","<canvas class='iconcaptcha-modal__body-icons'></canvas>","</div>","<div class='iconcaptcha-modal__footer'>");var t=i.general.showCredits?"":"display: none";e.push("<span style='".concat(t,"'><a href='").concat(q,"' target='_blank' rel='follow' title='").concat(k,"'>IconCaptcha</a> &copy;</span>")),e.push("</div>","<div class='iconcaptcha-modal__fields'>","<input type='hidden' name='ic-rq' value='1' required style='display:none;' />");for(var n=0,a=["wid","cid","hp"];n<a.length;n++){var o=a[n];e.push("<input type='hidden' name='ic-".concat(o,"' required style='display:none;' />"))}e.push("</div></div>"),l.innerHTML=e.join(""),r=l.querySelector(".iconcaptcha-modal__body")}(),C(),i.security.loadingAnimationDuration&&0<i.security.loadingAnimationDuration&&!i.security.displayInitialMessage?setTimeout(function(){return g(n)},i.security.loadingAnimationDuration):g(n)}function g(e){e=T({widgetId:c,action:"LOAD",theme:e,token:o});IconCaptchaPolyfills.ajax({url:i.general.endpoint,type:"POST",headers:L(o),data:{payload:e},success:function(e){if(e&&"string"==typeof e){var t=j(e);if(a=t.identifier,t.error)return void A(t.error,t.data);if(t.completed&&!t.challenge)return O(),void w();null!==(e=l.querySelector('input[name="ic-cid"]'))&&void 0!==e&&e.setAttribute("value",a),null!==(e=l.querySelector('input[name="ic-wid"]'))&&void 0!==e&&e.setAttribute("value",c);e=r.querySelector(".iconcaptcha-modal__body-icons");!function(t,e,n){var a,o=window.getComputedStyle(t),i=parseInt(null==o||null===(a=o.getPropertyValue("width"))||void 0===a?void 0:a.replace("px","")),o=parseInt(null==o||null===(r=o.getPropertyValue("height"))||void 0===r?void 0:r.replace("px","")),r=i<M,c=r?i/(M/E):o;t.width=i,t.style.width="".concat(i,"px"),t.height=c,t.style.height="".concat(c,"px"),r&&(o=Math.round((o-c)/2),t.style.marginTop="".concat(o,"px"));var l=new Image;l.src="data:image/png;base64,".concat(e),l.onload=function(){var e;null!==(e=t.getContext("2d"))&&void 0!==e&&e.drawImage(l,0,0,i,c),n()},l.complete&&l.onload(this)}(e,t.challenge,function(){!function(){var e;r.classList.remove("captcha-opacity");var t=r.querySelector(".captcha-loader");null==t||null!==(e=t.parentNode)&&void 0!==e&&e.removeChild(t)}()}),e.parentNode.insertAdjacentHTML("beforeend",'<div class="iconcaptcha-modal__body-selection"><i></i></div>'),n=r.querySelector(".iconcaptcha-modal__body-selection > i"),function(e){for(var t in e._ic_listeners={click:function(e){var t,n,a;new Date-f<=i.security.interactionDelay||i.security.hoverProtection&&!y||(t=IconCaptchaPolyfills.offset(e.currentTarget),n=e.pageX-t.left,a=e.pageY-t.top,n&&a&&(r.classList.contains("captcha-opacity")||(IconCaptchaPolyfills.trigger(l,"selected",{captchaId:c}),i.security.loadingAnimationDuration&&0<i.security.loadingAnimationDuration?(C(),setTimeout(function(){return _(n,a)},i.security.loadingAnimationDuration)):_(n,a))))},mousemove:function(e){y&&!h&&p&&x(e)},mouseenter:function(e){n.style.display="inline",x(e),y=!0},mouseleave:function(){n.style.display="none",y=!1}},e._ic_listeners)e.addEventListener(t,e._ic_listeners[t])}(l.querySelector(".iconcaptcha-modal__body-selection")),p||IconCaptchaPolyfills.trigger(l,"init",{captchaId:c});e=r.querySelector(".iconcaptcha-modal__body-selection");return u=Math.round(IconCaptchaPolyfills.width(e)),f=new Date,p=!0,void(null!=t&&t.expiredAt&&(t=t.expiredAt-Date.now(),d=setTimeout(S,t)))}P(!0,"The IconCaptcha could not be loaded.","Invalid data was returned by the captcha back-end service. Make sure IconCaptcha is installed/configured properly.")},error:function(){return A(-1)}})}function b(){l.classList.remove("iconcaptcha-error"),IconCaptchaPolyfills.empty(r),r.insertAdjacentHTML("beforeend","<canvas class='iconcaptcha-modal__body-icons'></canvas>"),m(),IconCaptchaPolyfills.trigger(l,"refreshed",{captchaId:c})}function _(e,t){void 0!==e&&void 0!==t&&(h=!0,O(),e=Math.round(e),t=Math.round(t),n.style.display="none",t=T({widgetId:c,challengeId:a,action:"SELECTION",x:e,y:t,width:u,token:o}),IconCaptchaPolyfills.ajax({url:i.general.endpoint,type:"POST",headers:L(o),data:{payload:t},success:function(e){e=j(e);e.completed?w(e):I()},error:function(){return A(-1)}}))}function w(e){r.classList.remove("captcha-opacity"),D(l.querySelector(".iconcaptcha-modal__body-selection")),null!=e&&e.expiredAt&&(o=e.expiredAt-Date.now(),d=setTimeout(S,o));var t,n=_createForOfIteratorHelper(l.querySelectorAll(".iconcaptcha-modal__header, .iconcaptcha-modal__footer, .iconcaptcha-modal__body"));try{for(n.s();!(t=n.n()).done;){var a=t.value;a.parentNode.removeChild(a)}}catch(e){n.e(e)}finally{n.f()}l.classList.add("iconcaptcha-success");var e='<div class="iconcaptcha-modal__body">'+'<div class="iconcaptcha-modal__body-title">'.concat(i.locale.correct,"</div>")+'<div class="iconcaptcha-modal__body-checkmark">'.concat('<svg viewBox="0 0 98.5 98.5" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><path class="checkmark" d="M81.7 17.8C73.5 9.3 62 4 49.2 4 24.3 4 4 24.3 4 49.2s20.3 45.2 45.2 45.2 45.2-20.3 45.2-45.2c0-8.6-2.4-16.6-6.5-23.4L45.6 68.2 24.7 47.3" fill="none" stroke-miterlimit="10" stroke-width="8"/></svg>',"</div>"),o=i.general.showCredits?"":"display: none";e+="<div class='iconcaptcha-modal__body-info' style='".concat(o,"'>")+"<a href='".concat(q,"' target='_blank' rel='follow' title='").concat(k,"'>IconCaptcha &copy;</a>")+"</div>",e+="</div>",l.querySelector(".iconcaptcha-modal").innerHTML+=e,h=!1,IconCaptchaPolyfills.trigger(l,"success",{captchaId:c})}function I(e,t,n){n=!(2<arguments.length&&void 0!==n)||n;r.classList.remove("captcha-opacity"),D(l.querySelector(".iconcaptcha-modal__body-selection")),e=e||i.locale.incorrect.title,t=t||i.locale.incorrect.subtitle,l.classList.add("iconcaptcha-error"),r.innerHTML='<div class="iconcaptcha-modal__body-title">'.concat(e,"</div>")+'<div class="iconcaptcha-modal__body-subtitle">'.concat(t,"</div>"),h=!1,IconCaptchaPolyfills.trigger(l,"error",{captchaId:c}),n&&setTimeout(b,i.security.incorrectSelectionResetDelay)}function C(){r.classList.add("captcha-opacity"),r.insertAdjacentHTML("beforeend",'<div class="captcha-loader"></div>')}function S(){a=void 0,s=p=!1,b(),IconCaptchaPolyfills.trigger(l,"invalidated",{captchaId:c})}function O(){null!==d&&(clearTimeout(d),d=null)}function A(e,t){switch(e){case"too-many-attempts":I(i.locale.timeout.title,i.locale.timeout.subtitle,!1);var n=l.querySelector(".iconcaptcha-modal__header");n.parentNode.removeChild(n),IconCaptchaPolyfills.trigger(l,"timeout",{captchaId:c}),setTimeout(S,t);break;case"invalid-form-token":P(!0,"Captcha form token is missing or incorrect.","A server request was made without including a captcha token, however this option is enabled.");break;default:P(!0,"An unexpected error occurred.","An unexpected error occurred while IconCaptcha performed an action.")}}function P(e,t,n){n=2<arguments.length&&void 0!==n?n:"";I("Captcha Error",t,!1),console.error(n),e&&IconCaptchaPolyfills.trigger(l,"error",{captchaId:c})}function T(e){return btoa(JSON.stringify(_objectSpread(_objectSpread({},e),{},{timestamp:Date.now(),initTimestamp:v})))}function j(e){return JSON.parse(atob(e))}function L(e){return e?{"X-IconCaptcha-Token":e}:{}}function D(e){if(e&&e._ic_listeners)for(var t in e._ic_listeners)e.removeEventListener(t,e._ic_listeners[t])}function x(e){var t;null!=e.currentTarget&&(t=IconCaptchaPolyfills.offset(e.currentTarget),n.style.left=Math.round(e.pageX-t.left)-8+"px",n.style.top=Math.round(e.pageY-t.top)-7+"px")}P(!0,"IconCaptcha was configured incorrectly","The IconCaptcha option `general.endpoint` has not been set.")};return e}();null!=window.jQuery&&function(t){t.fn.extend({iconCaptcha:function(e){var n=[];return t.each(this,function(e,t){n.push(t)}),IconCaptcha.$init(n,e)}})}(jQuery);
\ No newline at end of file
diff --git a/examples/forms/ajax-form.php b/examples/forms/ajax-form.php
index 9086a39..9257ef2 100644
--- a/examples/forms/ajax-form.php
+++ b/examples/forms/ajax-form.php
@@ -11,7 +11,7 @@
 <!DOCTYPE HTML>
 <html lang="en">
     <head>
-        <title>IconCaptcha v4.0.3 - By Fabian Wennink</title>
+        <title>IconCaptcha v4.0.4 - By Fabian Wennink</title>
         <meta charset="UTF-8" />
         <meta http-equiv="X-UA-Compatible" content="IE=11" />
         <meta name="author" content="Fabian Wennink © <?= date('Y') ?>" />
@@ -38,7 +38,7 @@
             <div class="shields">
                 <div class="shields-row">
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/releases" target="_blank" rel="noopener">
-                        <img src="https://img.shields.io/badge/version-4.0.3-orange.svg?style=flat-square" alt="Version 4.0.3"/>
+                        <img src="https://img.shields.io/badge/version-4.0.4-orange.svg?style=flat-square" alt="Version 4.0.4"/>
                     </a>
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/blob/master/LICENSE" target="_blank" rel="noopener">
                         <img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" alt="MIT license" />
@@ -96,6 +96,7 @@
 				        Icons made by <a href="https://blendicons.com" class="link-underline" target="_blank" rel="nofollow noopener">BlendIcons</a>.
                     </small>
                 </p>
+                <p><small>Running PHP <?= phpversion(); ?></small></p>
             </div>
         </div>
 
diff --git a/examples/forms/ajax/ajax-submit.php b/examples/forms/ajax/ajax-submit.php
index 4a4160d..872f3ce 100644
--- a/examples/forms/ajax/ajax-submit.php
+++ b/examples/forms/ajax/ajax-submit.php
@@ -25,7 +25,7 @@
     if ($validation->success()) {
         echo '<b>Captcha:</b> The form has been submitted!';
     } else {
-        echo '<b>Captcha:</b> Validation failed with error code:' . $validation->getErrorCode();
+        echo '<b>Captcha:</b> Validation failed with error code: ' . $validation->getErrorCode();
     }
 } else {
     echo '<b>Captcha:</b> No data posted!';
diff --git a/examples/forms/regular-form.php b/examples/forms/regular-form.php
index 2bd1ceb..370d560 100644
--- a/examples/forms/regular-form.php
+++ b/examples/forms/regular-form.php
@@ -31,7 +31,7 @@
 <!DOCTYPE HTML>
 <html lang="en">
     <head>
-        <title>IconCaptcha v4.0.3 - By Fabian Wennink</title>
+        <title>IconCaptcha v4.0.4 - By Fabian Wennink</title>
         <meta charset="UTF-8" />
         <meta http-equiv="X-UA-Compatible" content="IE=11" />
         <meta name="author" content="Fabian Wennink © <?= date('Y') ?>" />
@@ -58,7 +58,7 @@
             <div class="shields">
                 <div class="shields-row">
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/releases" target="_blank" rel="noopener">
-                        <img src="https://img.shields.io/badge/version-4.0.3-orange.svg?style=flat-square" alt="Version 4.0.3" />
+                        <img src="https://img.shields.io/badge/version-4.0.4-orange.svg?style=flat-square" alt="Version 4.0.4" />
                     </a>
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/blob/master/LICENSE" target="_blank" rel="noopener">
                         <img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" alt="MIT license" />
@@ -119,6 +119,7 @@
                         Icons made by <a href="https://blendicons.com" class="link-underline" target="_blank" rel="nofollow noopener">BlendIcons</a>.
                     </small>
                 </p>
+                <p><small>Running PHP <?= phpversion(); ?></small></p>
             </div>
         </div>
 
diff --git a/index.php b/index.php
index daa905d..f6db410 100644
--- a/index.php
+++ b/index.php
@@ -1,7 +1,7 @@
 <!DOCTYPE HTML>
 <html lang="en">
     <head>
-        <title>IconCaptcha v4.0.3 - By Fabian Wennink</title>
+        <title>IconCaptcha v4.0.4 - By Fabian Wennink</title>
         <meta charset="UTF-8" />
         <meta http-equiv="X-UA-Compatible" content="IE=11" />
         <meta name="author" content="Fabian Wennink © <?= date('Y') ?>" />
@@ -20,7 +20,7 @@
             <div class="shields">
                 <div class="shields-row">
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/releases" target="_blank" rel="noopener">
-                        <img src="https://img.shields.io/badge/version-4.0.3-orange.svg?style=flat-square" alt="Version 4.0.3" />
+                        <img src="https://img.shields.io/badge/version-4.0.4-orange.svg?style=flat-square" alt="Version 4.0.4" />
                     </a>
                     <a href="https://github.com/fabianwennink/IconCaptcha-PHP/blob/master/LICENSE" target="_blank" rel="noopener">
                         <img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" alt="MIT license" />
@@ -63,6 +63,7 @@
                         Icons made by <a href="https://blendicons.com" class="link-underline" target="_blank" rel="nofollow noopener">BlendIcons</a>.
                     </small>
                 </p>
+                <p><small>Running PHP <?= phpversion(); ?></small></p>
             </div>
         </div>
 
diff --git a/src/Challenge/Challenge.php b/src/Challenge/Challenge.php
index 828fb2a..5af7618 100644
--- a/src/Challenge/Challenge.php
+++ b/src/Challenge/Challenge.php
@@ -75,7 +75,7 @@ public function __construct($storage, array $options)
      * @param string $widgetId The widget identifier.
      * @param string|null $challengeId The challenge identifier.
      */
-    public function initialize(string $widgetId, string $challengeId = null): Challenge
+    public function initialize(string $widgetId, ?string $challengeId = null): Challenge
     {
         // Get the visitor's current IP address.
         $ipAddress = Utils::getIpAddress($this->options['ipAddress']);
diff --git a/src/Challenge/Hooks/InvalidHookException.php b/src/Challenge/Hooks/InvalidHookException.php
index ba07bf4..538cff0 100644
--- a/src/Challenge/Hooks/InvalidHookException.php
+++ b/src/Challenge/Hooks/InvalidHookException.php
@@ -20,7 +20,7 @@ class InvalidHookException extends Exception
      * @param string $path The path of the non-existing file.
      * @inheritDoc
      */
-    public function __construct(string $hook, string $message = null, int $code = 0, Throwable $previous = null)
+    public function __construct(string $hook, ?string $message = null, int $code = 0, ?Throwable $previous = null)
     {
         if ($message === null) {
             $message = "Hook \"$hook\" is invalid. A hook must be a class implementing the necessary interface.";
diff --git a/src/Challenge/Image/AbstractImageGenerator.php b/src/Challenge/Image/AbstractImageGenerator.php
index b1cff7f..0aaeed7 100644
--- a/src/Challenge/Image/AbstractImageGenerator.php
+++ b/src/Challenge/Image/AbstractImageGenerator.php
@@ -148,12 +148,10 @@ public function generate(string $iconPath, string $placeholderPath)
         }
 
         // Call the image generation hook, if provided.
-        $placeholder = Hook::call(
+        return Hook::call(
             'generation', GenerationHookInterface::class, 'generate',
             $this->session, $this->options, $placeholder, $placeholder
         );
-
-        return $placeholder;
     }
 
     /**
diff --git a/src/Challenge/ValidationResult.php b/src/Challenge/ValidationResult.php
index 196ce9c..f3e8acf 100644
--- a/src/Challenge/ValidationResult.php
+++ b/src/Challenge/ValidationResult.php
@@ -25,7 +25,7 @@ final class ValidationResult
      * @param bool $success
      * @param string|null $errorCode
      */
-    public function __construct(bool $success, string $errorCode = null)
+    public function __construct(bool $success, ?string $errorCode = null)
     {
         $this->success = $success;
         $this->errorCode = $errorCode;
diff --git a/src/Challenge/Validator.php b/src/Challenge/Validator.php
index 9f8d0b2..260139f 100644
--- a/src/Challenge/Validator.php
+++ b/src/Challenge/Validator.php
@@ -148,7 +148,7 @@ public function validate(array $request): ValidationResult
      * @return bool TRUE if the captcha session token matches the given tokens or if the token option is disabled,
      * FALSE if the captcha session token does not match the given tokens.
      */
-    public function validateToken(string $payloadToken, string $headerToken = null): bool
+    public function validateToken(string $payloadToken, ?string $headerToken = null): bool
     {
         // Only validate if the token option is enabled.
         if (!empty($this->options['token'])) {
diff --git a/src/Exceptions/FileNotFoundException.php b/src/Exceptions/FileNotFoundException.php
index 12e5806..9453487 100644
--- a/src/Exceptions/FileNotFoundException.php
+++ b/src/Exceptions/FileNotFoundException.php
@@ -20,7 +20,7 @@ class FileNotFoundException extends Exception
      * @param string $path The path of the non-existing file.
      * @inheritDoc
      */
-    public function __construct(string $path, string $message = null, int $code = 0, Throwable $previous = null)
+    public function __construct(string $path, ?string $message = null, int $code = 0, ?Throwable $previous = null)
     {
         if ($message === null) {
             $message = "File \"$path\" could not be found.";
diff --git a/src/Request.php b/src/Request.php
index 74ab44a..af9a71f 100644
--- a/src/Request.php
+++ b/src/Request.php
@@ -140,7 +140,7 @@ private function validateToken(array $payload): bool
     }
 
     /**
-     * Create a error message string for the token validation error.
+     * Create an error message string for the token validation error.
      */
     private function tokenError(): void
     {
diff --git a/src/Session/Drivers/KeyValueSession.php b/src/Session/Drivers/KeyValueSession.php
index 0f49066..10a62f1 100644
--- a/src/Session/Drivers/KeyValueSession.php
+++ b/src/Session/Drivers/KeyValueSession.php
@@ -34,7 +34,7 @@ class KeyValueSession extends Session
      * @param string $widgetId The captcha widget identifier.
      * @param string|null $challengeId The captcha challenge identifier.
      */
-    public function __construct(KeyValueStorageInterface $storage, array $options, string $ipAddress, string $widgetId, string $challengeId = null)
+    public function __construct(KeyValueStorageInterface $storage, array $options, string $ipAddress, string $widgetId, ?string $challengeId = null)
     {
         parent::__construct($options, $ipAddress, $widgetId, $challengeId);
 
diff --git a/src/Session/Exceptions/SessionDataParsingFailedException.php b/src/Session/Exceptions/SessionDataParsingFailedException.php
index 8e6736c..12025fa 100644
--- a/src/Session/Exceptions/SessionDataParsingFailedException.php
+++ b/src/Session/Exceptions/SessionDataParsingFailedException.php
@@ -21,7 +21,7 @@ class SessionDataParsingFailedException extends Exception
      *
      * @inheritDoc
      */
-    public function __construct(Throwable $previous = null)
+    public function __construct(?Throwable $previous = null)
     {
         $message = 'Failed to parse the data of a SessionData instance.';
 
diff --git a/src/Session/Session.php b/src/Session/Session.php
index ff83905..88fb06a 100644
--- a/src/Session/Session.php
+++ b/src/Session/Session.php
@@ -68,7 +68,7 @@ abstract class Session implements SessionInterface
      * @param string $widgetId The widget unique identifier.
      * @param string|null $challengeId The challenge unique identifier.
      */
-    public function __construct(array $options, string $ipAddress, string $widgetId, string $challengeId = null)
+    public function __construct(array $options, string $ipAddress, string $widgetId, ?string $challengeId = null)
     {
         $this->options = $options;
         $this->maxIdentifierTries = (int)$options['options']['identifierTries'];
diff --git a/src/Session/SessionFactory.php b/src/Session/SessionFactory.php
index da2cdca..5b72618 100644
--- a/src/Session/SessionFactory.php
+++ b/src/Session/SessionFactory.php
@@ -29,7 +29,7 @@ class SessionFactory
      * @return PDOSession|KeyValueSession|SessionInterface|mixed The generated session instance.
      * @throws InvalidArgumentException If the configuration contains an invalid driver.
      */
-    public static function create($storage, string $driver, array $options, string $ipAddress, string $widgetId, string $challengeId = null): SessionInterface
+    public static function create($storage, string $driver, array $options, string $ipAddress, string $widgetId, ?string $challengeId = null): SessionInterface
     {
         if (!isset($driver)) {
             throw new InvalidArgumentException('A session driver must be specified.');
diff --git a/src/Token/AbstractToken.php b/src/Token/AbstractToken.php
index fe3128f..172ba77 100644
--- a/src/Token/AbstractToken.php
+++ b/src/Token/AbstractToken.php
@@ -57,7 +57,7 @@ protected function generate(): string
      * @param $headerToken string|null The token sent with the request as a header. Can be empty in certain requests.
      * @return bool TRUE if the token(s) match the stored token, FALSE if it/they don't.
      */
-    protected function compareToken(string $storedToken, string $payloadToken, string $headerToken = null): bool
+    protected function compareToken(string $storedToken, string $payloadToken, ?string $headerToken = null): bool
     {
         // If the token is empty, the token was never requested.
         if (empty($storedToken)) {
diff --git a/src/Token/IconCaptchaToken.php b/src/Token/IconCaptchaToken.php
index ea329aa..fb31ee2 100644
--- a/src/Token/IconCaptchaToken.php
+++ b/src/Token/IconCaptchaToken.php
@@ -57,7 +57,7 @@ public function get(): string
     /**
      * @inheritDoc
      */
-    public function validate(string $payloadToken, string $headerToken = null): bool
+    public function validate(string $payloadToken, ?string $headerToken = null): bool
     {
         $sessionToken = $this->retrieve();
 
diff --git a/src/Token/TokenInterface.php b/src/Token/TokenInterface.php
index 125b4b0..f524819 100644
--- a/src/Token/TokenInterface.php
+++ b/src/Token/TokenInterface.php
@@ -36,5 +36,5 @@ public function get(): string;
      * value will be checked against the captcha token.
      * @return bool TRUE if the captcha token matches the given tokens, FALSE if it does not match.
      */
-    public function validate(string $payloadToken, string $headerToken = null): bool;
+    public function validate(string $payloadToken, ?string $headerToken = null): bool;
 }