/w/index.php?title=Especial:Restaurar&action=submit InvalidArgumentException: Invalid user parameter
from /srv/mediawiki/php-1.36.0-wmf.31/extensions/Echo/includes/model/Event.php(173)
#0 /srv/mediawiki/php-1.36.0-wmf.31/extensions/Echo/includes/EchoHooks.php(831): EchoEvent::create(array)
#1 /srv/mediawiki/php-1.36.0-wmf.31/includes/HookContainer/HookContainer.php(333): EchoHooks::onLinksUpdateAfterInsert(LinksUpdate, string, array)
#2 /srv/mediawiki/php-1.36.0-wmf.31/includes/HookContainer/HookContainer.php(140): MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, array)
#3 /srv/mediawiki/php-1.36.0-wmf.31/includes/HookContainer/HookRunner.php(2380): MediaWiki\HookContainer\HookContainer->run(string, array)
#4 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/LinksUpdate.php(518): MediaWiki\HookContainer\HookRunner->onLinksUpdateAfterInsert(LinksUpdate, string, array)
#5 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/LinksUpdate.php(237): LinksUpdate->incrTableUpdate(string, string, array, array)
#6 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/LinksUpdate.php(194): LinksUpdate->doIncrementalUpdate()
#7 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdates.php(513): LinksUpdate->doUpdate()
#8 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/RefreshSecondaryDataUpdate.php(101): DeferredUpdates::attemptUpdate(LinksUpdate, Wikimedia\Rdbms\LBFactoryMulti)
#9 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdates.php(513): RefreshSecondaryDataUpdate->doUpdate()
#10 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdates.php(390): DeferredUpdates::attemptUpdate(RefreshSecondaryDataUpdate, Wikimedia\Rdbms\LBFactoryMulti)
#11 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdates.php(221): DeferredUpdates::run(RefreshSecondaryDataUpdate, Wikimedia\Rdbms\LBFactoryMulti, Monolog\Logger, BufferingStatsdDataFactory, string)
#12 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdatesScope.php(264): DeferredUpdates::{closure}(RefreshSecondaryDataUpdate, integer)
#13 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdatesScope.php(196): DeferredUpdatesScope->processStageQueue(integer, integer, Closure)
#14 /srv/mediawiki/php-1.36.0-wmf.31/includes/deferred/DeferredUpdates.php(242): DeferredUpdatesScope->processUpdates(integer, Closure)
#15 /srv/mediawiki/php-1.36.0-wmf.31/includes/MediaWiki.php(1117): DeferredUpdates::doUpdates(string)
#16 /srv/mediawiki/php-1.36.0-wmf.31/includes/MediaWiki.php(853): MediaWiki->restInPeace()
#17 /srv/mediawiki/php-1.36.0-wmf.31/includes/MediaWiki.php(865): MediaWiki->{closure}()
#18 /srv/mediawiki/php-1.36.0-wmf.31/includes/MediaWiki.php(587): MediaWiki->doPostOutputShutdown()
#19 /srv/mediawiki/php-1.36.0-wmf.31/index.php(53): MediaWiki->run()
#20 /srv/mediawiki/php-1.36.0-wmf.31/index.php(46): wfIndexMain()
#21 /srv/mediawiki/w/index.php(3): require(string)
#22 {main}Impact
Noticed during wmf.31 group2 train deployment. Seemingly emanating from a LinksUpdate deferred update, all from the same URL. Impact is unknown.