Internal error

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[16fa3a98989f3c2210f4811d] /index.php?title=UC:IL:InterlockingEngineering&diff=10465&oldid=9701 Error: Call to a member function getUser() on null

Backtrace:

from /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/diff/DifferenceEngine.php(1667)
#0 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/diff/DifferenceEngine.php(1125): DifferenceEngine->getMultiNotice()
#1 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/diff/DifferenceEngine.php(1080): DifferenceEngine->getDiff(string, string, string)
#2 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/diff/DifferenceEngine.php(844): DifferenceEngine->showDiff(string, string, string)
#3 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/page/Article.php(908): DifferenceEngine->showDiffPage(boolean)
#4 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/page/Article.php(465): Article->showDiffPage()
#5 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/actions/ViewAction.php(78): Article->view()
#6 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/MediaWiki.php(542): ViewAction->show()
#7 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/MediaWiki.php(322): MediaWiki->performAction(Article, Title)
#8 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/MediaWiki.php(904): MediaWiki->performRequest()
#9 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/includes/MediaWiki.php(562): MediaWiki->main()
#10 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/index.php(50): MediaWiki->run()
#11 /var/www/vhosts/hosting144175.a2e88.netcup.net/httpdocs/wiki2.railml.org-mediawiki-1.39/index.php(46): wfIndexMain()
#12 {main}