Update app.py

app.py

@@ -114,7 +114,8 @@ def create_agent():
 
 def respond(msg, chat_history, temperature, max_new_tokens, max_tokens, multi_agent, conversation, max_round):
     if not isinstance(msg, str) or len(msg.strip()) <= 10:
-        return chat_history + [{"role": "assistant", "content": "Hi, I am TxAgent. Please provide a valid message longer than 10 characters."}]
+        chat_history.append({"role": "assistant", "content": "Hi, I am TxAgent. Please provide a valid message longer than 10 characters."})
+        return chat_history
 
     message = msg.strip()
     chat_history.append({"role": "user", "content": message})