diff --git a/src/Appwrite/Platform/Modules/Databases/Http/Databases/Collections/Documents/Action.php b/src/Appwrite/Platform/Modules/Databases/Http/Databases/Collections/Documents/Action.php
index 65b3be2130..7cac57bfa7 100644
--- a/src/Appwrite/Platform/Modules/Databases/Http/Databases/Collections/Documents/Action.php
+++ b/src/Appwrite/Platform/Modules/Databases/Http/Databases/Collections/Documents/Action.php
@@ -264,6 +264,8 @@ abstract class Action extends DatabasesAction
             $relationId = $relation;
         } elseif (\is_array($relation) && \array_values($relation) !== $relation) {
             $relationId = $relation['$id'] ?? null;
+        } else {
+            throw new Exception(Exception::GENERAL_BAD_REQUEST, 'Relationship value must be an object, document ID string, or associative array');
         }
 
         if ($relationId !== null) {