Update main.py

main.py

@@ -141,13 +141,17 @@ async def webhook(
     body = await request.body()
     try:
         background_tasks.add_task(
-            line_bot_manager.line_handler.async_handle, body.decode("utf-8"), x_line_signature # 修改這裡
+             self.run_sync_handler, line_bot_manager.line_handler, body.decode("utf-8"), x_line_signature # 修改這裡
         )
     except InvalidSignatureError:
         logging.warning("收到無效的簽章")
         raise HTTPException(status_code=400, detail="無效的簽章")
     return "ok"
 
+# 定義一個方法讓 line_handler 可以正確處理非同步事件
+async def run_sync_handler(handler, body, signature):
+    await asyncio.to_thread(handler.handle, body, signature)
+
 # --- 4. 對話 Session 管理 ---
 class ChatSessionManager:
     """