[aadb7401e8155df042ff3fbf] /wiki/Special:UserMerge CannotCreateActorException from line 2190 of /var/www/wiki/mediawiki/core/includes/user/User.php: Cannot create an actor for a usable name that is not an existing user: user_id=0 user_name="Anonymous"

Backtrace:

#0 /var/www/wiki/mediawiki/extensions/UserMerge/includes/MergeUser.php(369): User->getActorId(Wikimedia\Rdbms\MaintainableDBConnRef)
#1 /var/www/wiki/mediawiki/extensions/UserMerge/includes/MergeUser.php(50): MergeUser->mergeDatabaseTables(string)
#2 /var/www/wiki/mediawiki/extensions/UserMerge/includes/SpecialUserMerge.php(128): MergeUser->merge(User, string)
#3 /var/www/wiki/mediawiki/core/includes/htmlform/HTMLForm.php(694): SpecialUserMerge->onSubmit(array, OOUIHTMLForm)
#4 /var/www/wiki/mediawiki/core/includes/htmlform/HTMLForm.php(586): HTMLForm->trySubmit()
#5 /var/www/wiki/mediawiki/core/includes/htmlform/HTMLForm.php(601): HTMLForm->tryAuthorizedSubmit()
#6 /var/www/wiki/mediawiki/core/includes/specialpage/FormSpecialPage.php(187): HTMLForm->show()
#7 /var/www/wiki/mediawiki/core/includes/specialpage/SpecialPage.php(582): FormSpecialPage->execute(NULL)
#8 /var/www/wiki/mediawiki/core/includes/specialpage/SpecialPageFactory.php(623): SpecialPage->run(NULL)
#9 /var/www/wiki/mediawiki/core/includes/MediaWiki.php(299): MediaWiki\SpecialPage\SpecialPageFactory->executePath(Title, RequestContext)
#10 /var/www/wiki/mediawiki/core/includes/MediaWiki.php(978): MediaWiki->performRequest()
#11 /var/www/wiki/mediawiki/core/includes/MediaWiki.php(535): MediaWiki->main()
#12 /var/www/wiki/mediawiki/core/index.php(47): MediaWiki->run()
#13 {main}