diff --git a/app/controller/add_langgraph_chat_route.py b/app/controller/add_langgraph_chat_route.py
index a2ec134..7c5b356 100644
--- a/app/controller/add_langgraph_chat_route.py
+++ b/app/controller/add_langgraph_chat_route.py
@@ -243,7 +243,7 @@ def add_langgraph_chat_route(app: FastAPI):
 
   # 删除聊天记录
   @app.post("/langgraph/chat_remove/{thread_id}")
-  async def langgraph_chat(thread_id: str, checkpointer: AsyncPostgresSaverDep, session=AsyncSessionDep):
+  async def langgraph_chat(thread_id: str, checkpointer: AsyncPostgresSaverDep, session: AsyncSessionDep):
     await ConversationService.item_delete(session=session, row_dict={"id": thread_id})
     await checkpointer.adelete_thread(thread_id)
     return {"result": "success"}