Started on April 14, 2023 and affects idwiki only as far as I can see, which around 12k errors as of this Task.
All pages affected by this error return a fatal error when trying to view them. Curiously, if you hit the edit tab and then save without making any change makes the fatal go away.
Error
- service.version: 1.41.0-wmf.4
- trace.id: 4b0f18d7-cc9c-4c30-a4e8-982f2d0ccda9
- Find trace.id in Logstash
labels.normalized_message
[{reqId}] {exception_url} Error: Call to a member function getComment() on nullerror.stack_trace
from /srv/mediawiki/php-1.41.0-wmf.4/extensions/Wikistories/includes/hooks/RecentChangesPropagationHooks.php(467)
#0 /srv/mediawiki/php-1.41.0-wmf.4/includes/HookContainer/HookContainer.php(160): MediaWiki\Extension\Wikistories\hooks\RecentChangesPropagationHooks->onOldChangesListRecentChangesLine(OldChangesList, string, RecentChange, array, array)
#1 /srv/mediawiki/php-1.41.0-wmf.4/includes/HookContainer/HookRunner.php(2625): MediaWiki\HookContainer\HookContainer->run(string, array)
#2 /srv/mediawiki/php-1.41.0-wmf.4/includes/changes/OldChangesList.php(60): MediaWiki\HookContainer\HookRunner->onOldChangesListRecentChangesLine(OldChangesList, string, RecentChange, array, array)
#3 /srv/mediawiki/php-1.41.0-wmf.4/includes/specials/SpecialRecentChanges.php(597): OldChangesList->recentChangesLine(RecentChange, boolean, integer)
#4 /srv/mediawiki/php-1.41.0-wmf.4/includes/specialpage/ChangesListSpecialPage.php(1585): SpecialRecentChanges->outputChangesList(Wikimedia\Rdbms\MysqliResultWrapper, MediaWiki\Html\FormOptions)
#5 /srv/mediawiki/php-1.41.0-wmf.4/includes/specialpage/ChangesListSpecialPage.php(681): ChangesListSpecialPage->webOutput(Wikimedia\Rdbms\MysqliResultWrapper, MediaWiki\Html\FormOptions)
#6 /srv/mediawiki/php-1.41.0-wmf.4/includes/specials/SpecialRecentChanges.php(208): ChangesListSpecialPage->execute(string)
#7 /srv/mediawiki/php-1.41.0-wmf.4/includes/specialpage/SpecialPage.php(701): SpecialRecentChanges->execute(string)
#8 /srv/mediawiki/php-1.41.0-wmf.4/includes/specialpage/SpecialPageFactory.php(1497): SpecialPage->run(string)
#9 /srv/mediawiki/php-1.41.0-wmf.4/includes/MediaWiki.php(328): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#10 /srv/mediawiki/php-1.41.0-wmf.4/includes/MediaWiki.php(926): MediaWiki->performRequest()
#11 /srv/mediawiki/php-1.41.0-wmf.4/includes/MediaWiki.php(579): MediaWiki->main()
#12 /srv/mediawiki/php-1.41.0-wmf.4/index.php(50): MediaWiki->run()
#13 /srv/mediawiki/php-1.41.0-wmf.4/index.php(46): wfIndexMain()
#14 /srv/mediawiki/w/index.php(3): require(string)
#15 {main}