Console Errors #2849

When adding a ? in a comment box https://github.com/sindresorhus/refined-github/blob/767a210d4d5f9e4b58598bed95f218f57ebfe296/source/features/improve-shortcut-help.tsx#L49 test on https://github.com/sindresorhus/refined-github/commit/cb8de12eb680475024c21d5586aa31a232493c73 add a ? in the comment box

content.js:4679 Uncaught TypeError: Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.
    at HTMLDocument.<anonymous> (content.js:4679)

Pr-braches fails if the user is 👻 @ghost test on https://github.com/drop-ice/dear-github-2.0/pulls?q=is%3Apr+sort%3Aupdated-desc+is%3Aclosed

content.js:12365 ❌ Refined GitHub: feature `pr-branches`

 TypeError: Cannot read property 'login' of null
    at normalizeBranchInfo (content.js:7195)
    at pr_branches_init (content.js:7247)
    at async features_run (content.js:2923) 

Search for open issues:
https://github.com/sindresorhus/refined-github/issues?q=is%3Aissue+Cannot%20read%20property%20'login'%20of%20null

or open a new one:
https://github.com/sindresorhus/refined-github/issues/new?labels=bug&template=bug_report.md&title=%60pr-branches%60%3A%20Cannot%20read%20property%20'login'%20of%20null