0.113.1 Developer Tools shadowRoot.querySelector(...) is null

[tomlut]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.

The problem

Opening developer tools and moving between any of the tabs causes this error:

Logger: frontend.js.latest.202007160
Source: components/system_log/init.py:209
First occurred: 9:57:35 AM (1 occurrences)
Last logged: 9:57:35 AM
https://[my domain redacted].duckdns.org/frontend_latest/chunk.cf565e41b8a8dce0642a.js:133:204 TypeError: this.shadowRoot.querySelector(...) is null

Expected behavior

Not generating the error.

Steps to reproduce

Open developer tools.
Move to any Tab e.g. Services
Look at Log.

Environment

• Home Assistant release with the issue: 0.113.1
• Last working Home Assistant release (if known): 0.112.4
• Browser and browser version: Firefox 78.0.2 , Chrome 84.0.4147.89
• Operating system: Windows 10, 1909 Pro

State of relevant entities

Problem-relevant configuration

Javascript errors shown in your browser console/inspector

Additional information

[bramkragten]

Duplicate of #6448