Error "can't access property "error", t is null" when trying to load panel after v5.5.0 update

The CMS Questions
1

Site works fine in 5.4.4, but when I updated to 5.5.0, I can load the System page and the Users page, but trying to access any site panel page returns the error “can’t access property “error”, t is null”

I went to create a github issue, but I see new issues are restricted there now, so I’m opening this forum thread.

2

Could you please provide the full console error output?

And I am not aware we restrict issue creation. Will look into it.