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Internal error of type "TypeError" when viewing specific articles on nonbinarywiki
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Description

When accessing certain articles on nonbinarywiki, such as this one, I get an error message that reads [a5b64f8877c514f44e38e3c9] 2020-10-28 16:46:38: Fatal exception of type "TypeError". Happens both logged in and out, and another user is able to confirm the same error.

It was first reported to me yesterday, so maybe it's related to the MediaWiki update.

Event Timeline

Unknown Object (User) triaged this task as High priority.Oct 28 2020, 16:53
Unknown Object (User) added projects: MediaWiki, Site Reliability Engineering.

Setting to high priority since this is a fatal exception and therefore needs to be handled ASAP.

Unknown Object (User) moved this task from Radar to Bugs on the Site Reliability Engineering board.Oct 28 2020, 16:55
Unknown Object (User) moved this task from Backlog to Bugs on the MediaWiki board.

To add to the original report, it looks like the error is affect logs as well. We blocked a user and it shows up in the block list, but no in the Special:Log/blocks page.

exception:

2020-10-28 17:13:35 mw5 nonbinarywiki: [721eb63b7a8cdcc6091317bf] /wiki/Mar_Hicks   TypeError from line 23 of /srv/mediawiki/w/extensions/Translate/src/PageTranslation/TranslatablePageParser.php: Argument 1 passed to MediaWiki\Extensions\Translate\PageTranslation\TranslatablePageParser::containsMarkup() must be of the type string, null given, called in /srv/mediawiki/w/extensions/Translate/tag/PageTranslationHooks.php on line 50