symfony
diff --git a/‎src/Symfony/Component/Serializer/Normalizer/UidNormalizer.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Normalizer/UidNormalizer.php
+6Lines changed: 6 additions & 0 deletions b/‎src/Symfony/Component/Serializer/Normalizer/UidNormalizer.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Normalizer/UidNormalizer.php
+6Lines changed: 6 additions & 0 deletions
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Serializer\Normalizer;
 
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
 use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
 use Symfony\Component\Uid\AbstractUid;
 use Symfony\Component\Uid\Ulid;
@@ -23,6 +24,11 @@ final class UidNormalizer implements NormalizerInterface, DenormalizerInterface,
      */
     public function normalize($object, string $format = null, array $context = [])
     {
+        if (!$object instanceof AbstractUid) {
+            throw new InvalidArgumentException('The object must be an instance of "Symfony\Component\Uid\AbstractUid".');
+        }
+
+
         return (string) $object;
     }