Update main.py

main.py

@@ -118,10 +118,10 @@ def get_previous_message(user_id):
 def handle_image_message(event):
     user_id = event.source.user_id
     if user_id in chat_sessions:
-        chat_session = chat_sessions[user_id]
+        chat = chat_sessions[user_id]
     else:
-        chat_session = model.start_chat(history=[])
-    chat[user_id] = chat_session
+        chat = model.start_chat(history=[])
+        chat[user_id] = chat
     
     # 從 LINE API 獲取圖片數據
     image_path = get_image_url(event.message.id)