diff --git a/changelog.md b/changelog.md
index e9f36bf..e96d99c 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,17 @@
 # Reykjavik Changelog
 
+## 1.5.1
+
+* **Update**: Preventing JavaScript error for CSS variables incompatible browsers fallback
+
+### Files changed:
+
+	changelog.md
+	readme.txt
+	style.css
+	library/includes/classes/class-css-variables.php
+
+
 ## 1.5.0
 
 * **Update**: Improving touch screen navigation
diff --git a/library/includes/classes/class-css-variables.php b/library/includes/classes/class-css-variables.php
index fbcce9a..d8bb215 100644
--- a/library/includes/classes/class-css-variables.php
+++ b/library/includes/classes/class-css-variables.php
@@ -8,7 +8,7 @@
  * @subpackage  Customize
  *
  * @since    1.4.0
- * @version  1.4.1
+ * @version  1.5.1
  *
  * Contents:
  *
@@ -259,7 +259,7 @@ public static function get_variable_declaration( $variable, $value ) {
 		 * @link  https://github.com/jhildenbiddle/css-vars-ponyfill
 		 *
 		 * @since    1.4.0
-		 * @version  1.4.0
+		 * @version  1.5.1
 		 */
 		public static function compatibility() {
 
@@ -274,7 +274,12 @@ public static function compatibility() {
 
 				wp_add_inline_script(
 					'css-vars-ponyfill',
-					"cssVars( { onlyVars: true, exclude: 'link:not([href^=\"" . esc_url_raw( get_theme_root_uri() ) . "\"])' } );"
+					'window.onload = function() {' . PHP_EOL .
+					"\t" . 'cssVars( {' . PHP_EOL .
+					"\t\t" . 'onlyVars: true,' . PHP_EOL .
+					"\t\t" . 'exclude: \'link:not([href^="' . esc_url_raw( get_theme_root_uri() ) . '"])\'' . PHP_EOL .
+					"\t" . '} );' . PHP_EOL .
+					'};'
 				);
 
 		} // /compatibility
diff --git a/readme.txt b/readme.txt
index ce06e2b..c8d6b0f 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: webmandesign
 Tags: one-column, two-columns, right-sidebar, grid-layout, flexible-header, accessibility-ready, custom-background, custom-colors, custom-header, custom-menu, custom-logo, editor-style, featured-image-header, featured-images, footer-widgets, full-width-template, rtl-language-support, sticky-post, theme-options, threaded-comments, translation-ready, blog, e-commerce, portfolio
 Requires at least: 4.7.0
 Tested up to: 5.0.3
-Stable tag: 1.5.0
+Stable tag: 1.5.1
 License: GNU General Public License v3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -37,8 +37,8 @@ Please see `changelog.md` file.
 
 == Upgrade Notice ==
 
-= 1.5.0 =
-Improving navigation touch screen functionality, improving excerpt display, security and accessibility.
+= 1.5.1 =
+Preventing JavaScript error for CSS variables incompatible browsers fallback.
 
 
 == Resources ==
diff --git a/style.css b/style.css
index 05e7047..1781b96 100644
--- a/style.css
+++ b/style.css
@@ -3,7 +3,7 @@ Theme Name:   Reykjavik
 Theme URI:    https://www.webmandesign.eu/portfolio/reykjavik-wordpress-theme/
 Author:       WebMan Design
 Author URI:   https://www.webmandesign.eu/
-Version:      1.5.0
+Version:      1.5.1
 Text Domain:  reykjavik
 Domain Path:  /languages
 License:      GNU General Public License v3