Argument #1 ($link) must be of type Drupal\linkchecker\LinkCheckerLinkInterface, null given

Here also a patch file that can be used in your projects.

This sounds like the same issue as https://www.drupal.org/i/3247070 →

Could you have a look there and see if we can close this one and collaborate on a fix in that issue? 🤓

The workaround for me was to disable link rewriting entirely in the Linkchecker settings (the default is to rewrite links after 3 failed checks).

The patch that returns when no $link is found 🐛 TypeError in LinkStatusHandle.php Needs work suppresses the error in the site logs, but saving a page still shows the white screen (WSOD).

For context, I have LC indexing all rich text fields on my site, including in paragraphs. It hasn't completed scanning all fields yet, not sure if that could be causing any clashes?

I reproduced this issue and prepared a fix here - https://git.drupalcode.org/project/linkchecker/-/merge_requests/51

a) Added post_update hook to fix orphaned entries in queues
b) Added cleanUpQueues method that is being called in linkchecker_entity_delete for instances of LinkCheckerLinkInterface.
c) Updated/added new tests

Please review