报错：
[04-Mar-2021 14:20:03 UTC] PHP Warning: Creating default object from empty value in /home/judge/ccassistant/inc/lang.php on line 5

未初始化：
5 $lang->index->index = '网站导航';
6 $lang->index->about = '关于我们';
7 $lang->index->notice = '本站公告';

请问怎么解决？