打包后报错，部署到线上，footer 不显示，且有报错输出

```shell
Uncaught TypeError: Cannot set properties of null (setting 'innerHTML')
    at me (%E8%84%9A%E6%9C%AC.js?v=2rherm:1:1534)
    at ve (%E8%84%9A%E6%9C%AC.js?v=2rherm:1:1597)
    at FileReader.<anonymous> (%E8%84%9A%E6%9C%AC.js?v=2rherm:1:1462)
```