diff --git a/kdb-bot/src/bot_data/service/auth_user_repository_service.py b/kdb-bot/src/bot_data/service/auth_user_repository_service.py
index 295e3c2f..397c31f8 100644
--- a/kdb-bot/src/bot_data/service/auth_user_repository_service.py
+++ b/kdb-bot/src/bot_data/service/auth_user_repository_service.py
@@ -28,7 +28,7 @@ class AuthUserRepositoryService(AuthUserRepositoryABC):
 
     @staticmethod
     def _get_value_from_result(value: any) -> Optional[any]:
-        if isinstance(value, str) and "NULL" in value:
+        if isinstance(value, str) and "null" in value:
             return None
 
         return value