Internal error

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[4592204e4d7dfd69397b7b34] /w/index.php?title=Template:Conferences&diff=cur&oldid=8356 Error: Call to a member function getUser() on null

Backtrace:

from /home/infovis-wiki/infovis-wiki.net/w/includes/diff/DifferenceEngine.php(1677)
#0 /home/infovis-wiki/infovis-wiki.net/w/includes/diff/DifferenceEngine.php(1204): DifferenceEngine->getMultiNotice()
#1 /home/infovis-wiki/infovis-wiki.net/w/includes/diff/DifferenceEngine.php(1159): DifferenceEngine->getDiff()
#2 /home/infovis-wiki/infovis-wiki.net/w/includes/diff/DifferenceEngine.php(922): DifferenceEngine->showDiff()
#3 /home/infovis-wiki/infovis-wiki.net/w/includes/page/Article.php(952): DifferenceEngine->showDiffPage()
#4 /home/infovis-wiki/infovis-wiki.net/w/includes/page/Article.php(486): Article->showDiffPage()
#5 /home/infovis-wiki/infovis-wiki.net/w/includes/actions/ViewAction.php(78): Article->view()
#6 /home/infovis-wiki/infovis-wiki.net/w/includes/MediaWiki.php(556): ViewAction->show()
#7 /home/infovis-wiki/infovis-wiki.net/w/includes/MediaWiki.php(333): MediaWiki->performAction()
#8 /home/infovis-wiki/infovis-wiki.net/w/includes/MediaWiki.php(923): MediaWiki->performRequest()
#9 /home/infovis-wiki/infovis-wiki.net/w/includes/MediaWiki.php(576): MediaWiki->main()
#10 /home/infovis-wiki/infovis-wiki.net/w/index.php(50): MediaWiki->run()
#11 /home/infovis-wiki/infovis-wiki.net/w/index.php(46): wfIndexMain()
#12 {main}