diff --git a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
index cf690aa9291be..27f2dd8927a37 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver.php
@@ -43,7 +43,7 @@ public function __construct(ArgumentMetadataFactoryInterface $argumentMetadataFa
     public function getArguments(Request $request, callable $controller): array
     {
         $arguments = [];
-        $reflectors = $request->attributes->get('_controller_reflectors') ?? [];
+        $reflectors = $request->attributes->get('_controller_reflectors') ?? NULL;
 
         foreach ($this->argumentMetadataFactory->createArgumentMetadata($controller, ...$reflectors) as $metadata) {
             foreach ($this->argumentValueResolvers as $resolver) {