diff --git a/src/ObjectResolver.php b/src/ObjectResolver.php
index 38beaf0..9333adb 100644
--- a/src/ObjectResolver.php
+++ b/src/ObjectResolver.php
@@ -85,7 +85,6 @@ class ObjectResolver {
                 foreach ($property['tags'] as $item) {
                     if ($item['object'] instanceof $class) {
                         $list[$property['name']] ??= [];
-
                         $list[$property['name']][] = $this->instanciateAnnotationObject($item);
                     }
                 }
@@ -216,6 +215,10 @@ class ObjectResolver {
             $obj->$key = $value;
         }
 
+        if ( ! $obj instanceof \Notes\Attribute ) {
+            throw new \RuntimeException(sprintf("An error occurred trying to retrieve an Attribute def:%s from class %s", json_encode($tagDefinition), $this->objectClass));
+        }
+
         return $obj;
     }