Undefined array key "path" in canonical.php on line 590

[antont39]

I get an warning message on the main page when I'm at /page/1 and permalink(/%category%/%postname%) is set without a trailing slash.
And there is no redirect /page/1 -> /

Make sure $redirect['path'] is defined after parsing the $redirect_url.

Trac ticket: https://core.trac.wordpress.org/ticket/55653

[lopo]

Welcome @antont39 and thanks for reporting this!
I can reproduce the problem on 6.0.
At first I was considering forcing a / when setting a custom permalink, but the issue is there even if you set "Numeric" (i.e. /archives/%post_id%) which is a default choice in the Permalinks page.

Pushed a PR but on second thought is looks like it's a duplicate of #51725 and the solution there seems to be working.

[lopo]

Duplicate of #51725.

Closing since it's a duplicate of https://core.trac.wordpress.org/ticket/51725 and the solution there looks smarter.