diff --git a/api/controllers/service_api/app/conversation.py b/api/controllers/service_api/app/conversation.py
index 3c897df7c1..55600a3fd0 100644
--- a/api/controllers/service_api/app/conversation.py
+++ b/api/controllers/service_api/app/conversation.py
@@ -100,7 +100,6 @@ class ConversationVariablesApi(Resource):
     @validate_app_token(fetch_user_arg=FetchUserArg(fetch_from=WhereisUserArg.QUERY))
     @marshal_with(conversation_variable_infinite_scroll_pagination_fields)
     def get(self, app_model: App, end_user: EndUser, c_id):
-
         # conversational variable only for chat app
         app_mode = AppMode.value_of(app_model.mode)
         if app_mode not in {AppMode.CHAT, AppMode.AGENT_CHAT, AppMode.ADVANCED_CHAT}:
diff --git a/api/services/conversation_service.py b/api/services/conversation_service.py
index bbad5fd71d..afdaa49465 100644
--- a/api/services/conversation_service.py
+++ b/api/services/conversation_service.py
@@ -195,7 +195,7 @@ class ConversationService:
                 last_variable = session.scalar(stmt.where(ConversationVariable.id == last_id))
                 if not last_variable:
                     raise ConversationVariableNotExistsError()
-                
+
                 # Filter for variables created after the last_id
                 stmt = stmt.where(ConversationVariable.created_at > last_variable.created_at)