diff --git a/src/spaceone/identity/service/workspace_group_service.py b/src/spaceone/identity/service/workspace_group_service.py
index f2f6bdc2..c24cdca0 100644
--- a/src/spaceone/identity/service/workspace_group_service.py
+++ b/src/spaceone/identity/service/workspace_group_service.py
@@ -656,6 +656,8 @@ def update_user_info(
             workspace_group_info.users = updated_users
             return workspace_group_info.to_dict()
 
+        return {}
+
     def get_users_info_list(
         self,
         new_users_info_list: List[Dict[str, str]],