Interner Fehler

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[7c5360f3] /w/index.php?title=Seminar:Hauptseminar_Monster_in_der_mittelalterlichen_Literatur_WS_2020&action=history Exception from line 222 of /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/Hooks.php: Detected bug in an extension! Hook Cite::checkRefsNoReferences has invalid call signature; Parameter 2 to Cite::checkRefsNoReferences() expected to be a reference, value given

Backtrace:

#0 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/GlobalFunctions.php(3995): Hooks::run()
#1 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/parser/Parser.php(406): wfRunHooks()
#2 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/OutputPage.php(1653): Parser->parse()
#3 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/OutputPage.php(1594): OutputPage->addWikiTextTitle()
#4 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/OutputPage.php(3854): OutputPage->addWikiText()
#5 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/actions/HistoryAction.php(479): OutputPage->wrapWikiMsg()
#6 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/pager/IndexPager.php(432): HistoryPager->getStartBody()
#7 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/actions/HistoryAction.php(209): IndexPager->getBody()
#8 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/actions/FormlessAction.php(43): HistoryAction->onView()
#9 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/MediaWiki.php(414): FormlessAction->show()
#10 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/MediaWiki.php(282): MediaWiki->performAction()
#11 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/MediaWiki.php(584): MediaWiki->performRequest()
#12 /var/www/vhosts/mediaewiki.de/httpdocs/w/includes/MediaWiki.php(435): MediaWiki->main()
#13 /var/www/vhosts/mediaewiki.de/httpdocs/w/index.php(46): MediaWiki->run()
#14 {main}