Error
message
Error: Typed property MediaWiki\Extension\CampaignEvents\Event\EventRegistration::$participationOptions must not be accessed before initialization
trace
from /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/Event/EventRegistration.php(245)
#0 /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/EventPage/EventPageDecorator.php(448): MediaWiki\Extension\CampaignEvents\Event\EventRegistration->getParticipationOptions()
#1 /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/EventPage/EventPageDecorator.php(406): MediaWiki\Extension\CampaignEvents\EventPage\EventPageDecorator->getEventInfoHeaderRow(MediaWiki\Extension\CampaignEvents\Event\ExistingEventRegistration, int)
#2 /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/EventPage/EventPageDecorator.php(276): MediaWiki\Extension\CampaignEvents\EventPage\EventPageDecorator->getHeaderElement(MediaWiki\Extension\CampaignEvents\Event\ExistingEventRegistration, int)
#3 /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/EventPage/EventPageDecorator.php(164): MediaWiki\Extension\CampaignEvents\EventPage\EventPageDecorator->addRegistrationHeader(MediaWiki\Page\WikiPage, MediaWiki\Extension\CampaignEvents\Event\ExistingEventRegistration)
#4 /srv/mediawiki/php-1.45.0-wmf.4/extensions/CampaignEvents/src/Hooks/Handlers/ArticleViewHeaderHandler.php(35): MediaWiki\Extension\CampaignEvents\EventPage\EventPageDecorator->decoratePage(MediaWiki\Page\WikiPage)
#5 /srv/mediawiki/php-1.45.0-wmf.4/includes/HookContainer/HookContainer.php(155): MediaWiki\Extension\CampaignEvents\Hooks\Handlers\ArticleViewHeaderHandler->onArticleViewHeader(MediaWiki\Page\Article, null, bool)
#6 /srv/mediawiki/php-1.45.0-wmf.4/includes/HookContainer/HookRunner.php(880): MediaWiki\HookContainer\HookContainer->run(string, array)
#7 /srv/mediawiki/php-1.45.0-wmf.4/includes/page/Article.php(708): MediaWiki\HookContainer\HookRunner->onArticleViewHeader(MediaWiki\Page\Article, null, bool)
#8 /srv/mediawiki/php-1.45.0-wmf.4/includes/page/Article.php(551): MediaWiki\Page\Article->generateContentOutput(MediaWiki\User\User, MediaWiki\Parser\ParserOptions, int, MediaWiki\Output\OutputPage, array)
#9 /srv/mediawiki/php-1.45.0-wmf.4/includes/actions/ViewAction.php(80): MediaWiki\Page\Article->view()
#10 /srv/mediawiki/php-1.45.0-wmf.4/includes/actions/ActionEntryPoint.php(728): MediaWiki\Actions\ViewAction->show()
#11 /srv/mediawiki/php-1.45.0-wmf.4/includes/actions/ActionEntryPoint.php(505): MediaWiki\Actions\ActionEntryPoint->performAction(MediaWiki\Page\Article, MediaWiki\Title\Title)
#12 /srv/mediawiki/php-1.45.0-wmf.4/includes/actions/ActionEntryPoint.php(143): MediaWiki\Actions\ActionEntryPoint->performRequest()
#13 /srv/mediawiki/php-1.45.0-wmf.4/includes/MediaWikiEntryPoint.php(198): MediaWiki\Actions\ActionEntryPoint->execute()
#14 /srv/mediawiki/php-1.45.0-wmf.4/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#15 /srv/mediawiki/w/index.php(3): require(string)
#16 {main}Impact
Event pages fail to load and display this error instead. 423 occurrences in the last 3 hours (when the issue started).
Notes
The property name was changed in r1152266. My guess is that the cache (added for T392784) holds objects with the old property name that aren't therefore being unserialized properly.