出错了，面板运行时发生错误！

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面板、插件版本：不清楚

系统版本：Ubuntu 20.04.6

问题描述：报错

相关截图（日志、错误）：出错了，面板运行时发生错误！TypeError: can only concatenate str (not "NoneType") to str
REQUEST_DATE: 2025-09-20 14:12:09 PAN_VERSION: 7.7.0  OS_VERSION: Ubuntu 20.04.6 LTS armv7l(Py3.7.8) REMOTE_ADDR: 192.168.1.40 REQUEST_URI: GET /b5b48012?REQUEST_FORM: {}  USER_AGENT: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.6261.95 Safari/537.36Traceback (most recent call last):  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 2529, in wsgi_app    response = self.full_dispatch_request()  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1825, in full_dispatch_request    rv = self.handle_user_exception(e)  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1823, in full_dispatch_request    rv = self.dispatch_request()  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  File "/www/server/panel/BTPanel/__init__.py", line 1064, in login    data['lan'] = public.GetLan('login')  File "class/public.py", line 429, in GetLan    _LAN_TEMPLATE = json.loads(ReadFile('BTPanel/static/language/' + GetLanguage() + '/template.json'))TypeError: can only concatenate str (not "NoneType") to str

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