diff --git a/src/Miscellaneous/Utilities.php b/src/Miscellaneous/Utilities.php
index a5766dc..419fe35 100644
--- a/src/Miscellaneous/Utilities.php
+++ b/src/Miscellaneous/Utilities.php
@@ -87,7 +87,7 @@ public static function isNotExceedMax($value)
         if (self::isValidString($value) || self::isValidDouble($value)) {
             $parts = explode('.', $value);
             $integerPart = intval($parts[0]);
-            $decimalPart = intval($parts[1]);
+            $decimalPart = intval($parts[1] ?? 0);
 
             $validateInteger = is_numeric($integerPart) && filter_var($integerPart, FILTER_VALIDATE_INT) !== false;
             $validateDecimal = is_numeric($decimalPart) && filter_var($decimalPart, FILTER_VALIDATE_INT) !== false;
diff --git a/src/SpellNumber.php b/src/SpellNumber.php
index 3c133f5..a2a2162 100644
--- a/src/SpellNumber.php
+++ b/src/SpellNumber.php
@@ -154,6 +154,11 @@ private function integerToLetters()
     private function doubleToLetters()
     {
         $parts = explode('.', $this->value);
+
+        if (!array_key_exists(1, $parts)) {
+            return $this->integerToLetters();
+        }
+
         $letters1 = NumberFormatterWrapper::format($parts[0], $this->locale);
         $letters2 = NumberFormatterWrapper::format($parts[1], $this->locale);
 
@@ -181,6 +186,11 @@ private function integerToMoney()
     private function doubleToMoney()
     {
         $parts = explode('.', $this->value);
+
+        if (!array_key_exists(1, $parts)) {
+            return $this->integerToMoney();
+        }
+
         $letters1 = NumberFormatterWrapper::format($parts[0], $this->locale);
         $letters1 = Replaces::locale($letters1, $this->locale, $this->currency);