I just tried adding an RSS feed, https://rameznaam.com/blog/. This is a very infrequently updated blog, the last update being 3 March. I think that's relevant because in my log I see:

2022-05-15T13:20:17Z worker [INFO]: Feed is too old {"created":"Thu, 03 Mar 2022 19:45:36 +0000","uid":1,"uri":"http://rameznaam.com/?p=1858","worker_id":"86e944e","worker_cmd":"OnePoll"} - {"file":"Feed.php","line":493,"function":"import","uid":"0707de","process_id":1634}

Various pages die with a backtrace. For example https://friendica.exon.name/contact/40659/conversations:

Exception thrown in /var/www/friendica/src/Module/Contact/Conversations.php:78
Stack trace:
#0 /var/www/friendica/src/BaseModule.php(239): Friendica\Module\Contact\Conversations->content()
#1 /var/www/friendica/src/App.php(711): Friendica\BaseModule->run()
#2 /var/www/friendica/index.php(44): Friendica\App->runFrontend()
#3 {main}

In the database, I unexpectedly see two contacts for this blog. One of them 40658 has uid 0, the other 40659 has uid 1 (which is me).

I added the contact using the earlier 2022.05-rc, but I just did a git pull and unfortunately didn't record where I was before that. I also just tried adding the RSS feed again under a test account, and now I see "Not Found Contact not found". So perhaps the version matters, although either way it doesn't work.

I'd like to experiment more, if someone can tell me what's a good way to delete the contact first?

@Friendica Support