DOCKER部署，微信群聊功能正常，但单独聊天报错

[mydedeB]

[INFO][2024-07-06 08:23:19][link_ai_bot.py:346] - [LINKAI] knowledge base, search_hit=True, first_similarity=0.747
[ERROR][2024-07-06 08:23:19][chat_channel.py:303] - Worker return exception: can only concatenate list (not "str") to list
Traceback (most recent call last):
File "/usr/local/lib/python3.10/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
File "/app/channel/chat_channel.py", line 176, in _handle
reply = self._decorate_reply(context, reply)
File "/app/channel/chat_channel.py", line 261, in _decorate_reply
reply_text = conf().get("single_chat_reply_prefix", "") + reply_text + conf().get("single_chat_reply_suffix", "")
TypeError: can only concatenate list (not "str") to list