Internal error

[124bb95de3b8976a3cea8d26] /w/index.php?title=File:Manual:SMW-Kategorie-EN.png&oldid=24160&diff=prev Error from line 21 of /var/www/en.wiki.bluespice.com/w/extensions/BlueSpiceVisualDiff/includes/HTMLDiffEngine.class.php: Call to a member function getId() on null

Backtrace:

#0 /var/www/en.wiki.bluespice.com/w/extensions/BlueSpiceVisualDiff/VisualDiff.class.php(226): HTMLDiffEngine->showDiffPage(NULL, Revision)
#1 /var/www/en.wiki.bluespice.com/w/includes/Hooks.php(177): VisualDiff->onArticleContentOnDiff(DifferenceEngine, OutputPage)
#2 /var/www/en.wiki.bluespice.com/w/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#3 /var/www/en.wiki.bluespice.com/w/includes/diff/DifferenceEngine.php(607): Hooks::run(string, array)
#4 /var/www/en.wiki.bluespice.com/w/includes/diff/DifferenceEngine.php(480): DifferenceEngine->renderNewRevision()
#5 /var/www/en.wiki.bluespice.com/w/includes/page/Article.php(737): DifferenceEngine->showDiffPage(boolean)
#6 /var/www/en.wiki.bluespice.com/w/includes/page/Article.php(464): Article->showDiffPage()
#7 /var/www/en.wiki.bluespice.com/w/includes/page/ImagePage.php(150): Article->view()
#8 /var/www/en.wiki.bluespice.com/w/includes/actions/ViewAction.php(74): ImagePage->view()
#9 /var/www/en.wiki.bluespice.com/w/includes/MediaWiki.php(504): ViewAction->show()
#10 /var/www/en.wiki.bluespice.com/w/includes/MediaWiki.php(294): MediaWiki->performAction(ImagePage, Title)
#11 /var/www/en.wiki.bluespice.com/w/includes/MediaWiki.php(822): MediaWiki->performRequest()
#12 /var/www/en.wiki.bluespice.com/w/includes/MediaWiki.php(528): MediaWiki->main()
#13 /var/www/en.wiki.bluespice.com/w/index.php(42): MediaWiki->run()
#14 {main}

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