Update main.py

main.py

@@ -121,7 +121,7 @@ def handle_image_message(event):
         chat = chat_sessions[user_id]
     else:
         chat = model.start_chat(history=[])
-        chat[user_id] = chat
+        chat_sessions[user_id] = chat
     
     # 從 LINE API 獲取圖片數據
     image_path = get_image_url(event.message.id)