Home Assistant 2021.11.0 sidebar Issue

[vangelis86]

After the latest upgrade of Home Assistant 2021.11.0 custom-sidebar stopped working with the below error:

2021-11-03 20:35:42 ERROR (MainThread) [frontend.js.latest.202111030] https://<homeassistant_url>:8123/hacsfiles/custom-sidebar/custom-sidebar.js?hacstag=223008910022:162:66 Uncaught TypeError: Cannot read properties of null (reading 'setAttribute')

[ColinRobbins]

I think this is a duplicate of #40

[galloween]

see this for alternative version: #40 (comment)