diff --git a/src/Core/Metadata/Property/Factory/AnnotationSubresourceMetadataFactory.php b/src/Core/Metadata/Property/Factory/AnnotationSubresourceMetadataFactory.php
index 998650e51e6..8f17f0922f2 100644
--- a/src/Core/Metadata/Property/Factory/AnnotationSubresourceMetadataFactory.php
+++ b/src/Core/Metadata/Property/Factory/AnnotationSubresourceMetadataFactory.php
@@ -83,6 +83,10 @@ public function create(string $resourceClass, string $property, array $options =
                 return $this->updateMetadata($attributes[0]->newInstance(), $propertyMetadata, $resourceClass, $property);
             }
 
+            if (!$this->reader) {
+                return $propertyMetadata;
+            }
+
             $annotation = $this->reader->getMethodAnnotation($reflectionMethod, ApiSubresource::class);
             if ($annotation instanceof ApiSubresource) {
                 return $this->updateMetadata($annotation, $propertyMetadata, $resourceClass, $property);