diff --git a/src/Validator/Types/ArrayProxy.php b/src/Validator/Types/ArrayProxy.php
index 2ea2400..3aba38e 100644
--- a/src/Validator/Types/ArrayProxy.php
+++ b/src/Validator/Types/ArrayProxy.php
@@ -15,6 +15,9 @@ class ArrayProxy extends TypesProxy
      */
     public function dispatch(object $form, string $field, mixed $value): bool
     {
+        if (is_null($value) && !$this->allowsNull) {
+            return false;
+        }
         return $value == ($form->{$field} = $value);
     }
 
diff --git a/src/Validator/Types/BoolProxy.php b/src/Validator/Types/BoolProxy.php
index e01ec49..dbde676 100644
--- a/src/Validator/Types/BoolProxy.php
+++ b/src/Validator/Types/BoolProxy.php
@@ -15,6 +15,9 @@ class BoolProxy extends TypesProxy
      */
     public function dispatch(object $form, string $field, mixed $value): bool
     {
+        if (is_null($value) && !$this->allowsNull) {
+            return false;
+        }
         // TODO: Implement dispatch() method.
         if (in_array($value, ['false', 'true'])) {
             $form->{$field} = $value === 'true';
diff --git a/src/Validator/Types/FloatProxy.php b/src/Validator/Types/FloatProxy.php
index 5222cc0..a32c648 100644
--- a/src/Validator/Types/FloatProxy.php
+++ b/src/Validator/Types/FloatProxy.php
@@ -14,6 +14,9 @@ class FloatProxy extends TypesProxy
      */
     public function dispatch(object $form, string $field, mixed $value): bool
     {
+        if (is_null($value) && !$this->allowsNull) {
+            return false;
+        }
         return $value == ($form->{$field} = (float)$value);
     }
 }
\ No newline at end of file
diff --git a/src/Validator/Types/IntProxy.php b/src/Validator/Types/IntProxy.php
index b6fa2bd..98b14b8 100644
--- a/src/Validator/Types/IntProxy.php
+++ b/src/Validator/Types/IntProxy.php
@@ -14,6 +14,9 @@ class IntProxy extends TypesProxy
      */
     public function dispatch(object $form, string $field, mixed $value): bool
     {
+        if (is_null($value) && !$this->allowsNull) {
+            return false;
+        }
         return $value == ($form->{$field} = (int)$value);
     }
 
diff --git a/src/Validator/Types/MixedProxy.php b/src/Validator/Types/MixedProxy.php
index a6641d7..f7d27fe 100644
--- a/src/Validator/Types/MixedProxy.php
+++ b/src/Validator/Types/MixedProxy.php
@@ -19,6 +19,9 @@ class MixedProxy extends TypesProxy
     public function dispatch(object $form, string $field, mixed $value): bool
     {
         try {
+            if (is_null($value) && !$this->allowsNull) {
+                return false;
+            }
             return $value == ($form->{$field} = $value);
         } catch (\Throwable $throwable) {
             return false;
diff --git a/src/Validator/Types/StringProxy.php b/src/Validator/Types/StringProxy.php
index ba47738..a564c77 100644
--- a/src/Validator/Types/StringProxy.php
+++ b/src/Validator/Types/StringProxy.php
@@ -15,6 +15,9 @@ class StringProxy extends TypesProxy
      */
     public function dispatch(object $form, string $field, mixed $value): bool
     {
+        if (is_null($value) && !$this->allowsNull) {
+            return false;
+        }
         return $value == ($form->{$field} = (string)$value);
     }