Bug Report

Steps to reproduce

add the darkmode button

What is current behaviour

What is the expected behaviour

Other relevant information

• Bug does still occur when all/other plugins are disabled?

• Your OS:

• Node.js version:

• npm/yarn version:

• Browser version:

• Docsify version:

• Docsify plugins:

Please create a reproducible sandbox

Mention the docsify version in which this bug was not present (if any)

https://docs.jerryc.me/src/bottom.js
I create the dark mode button,
it work fine.
but i check the console, it error show Uncaught TypeError: Cannot read property 'tagName' of null ?
what problem ? but the function is work fine.