diff --git a/src/Forms/Validator.php b/src/Forms/Validator.php
index 136c19fb6..0b0436a68 100644
--- a/src/Forms/Validator.php
+++ b/src/Forms/Validator.php
@@ -256,7 +256,7 @@ public static function validatePattern(IControl $control, string $pattern, bool
 		$regexp = "\x01^(?:$pattern)\\z\x01u" . ($caseInsensitive ? 'i' : '');
 		foreach (static::toArray($control->getValue()) as $item) {
 			$value = $item instanceof Nette\Http\FileUpload ? $item->getName() : $item;
-			if (!Strings::match($value, $regexp)) {
+			if (!Strings::match((string) $value, $regexp)) {
 				return false;
 			}
 		}
@@ -355,6 +355,6 @@ public static function validateImage(Controls\UploadControl $control): bool
 
 	private static function toArray($value): array
 	{
-		return $value instanceof Nette\Http\FileUpload ? [$value] : (array) $value;
+		return is_object($value) ? [$value] : (array) $value;
 	}
 }
diff --git a/tests/Forms/Controls.TestBase.validators.phpt b/tests/Forms/Controls.TestBase.validators.phpt
index 3eafd1f0b..43c2516f9 100644
--- a/tests/Forms/Controls.TestBase.validators.phpt
+++ b/tests/Forms/Controls.TestBase.validators.phpt
@@ -95,6 +95,26 @@ test(function () {
 	Assert::false(Validator::validatePattern($control, '[0-9]+X'));
 });
 
+test(function () {
+	$control = new TextInput;
+
+
+	$control->value = new class () {
+		public $lorem = 'ipsum';
+
+
+		public function __toString(): string
+		{
+			return '123x';
+		}
+	};
+
+
+	Assert::false(Validator::validatePattern($control, '[0-9]'));
+	Assert::true(Validator::validatePattern($control, '[0-9]+x'));
+	Assert::false(Validator::validatePattern($control, '[0-9]+X'));
+});
+
 test(function () {
 	$control = new TextInput;
 	$control->value = '123x';