Interner Fehler

[23b5d5a6f40e09f12ab69c78] /index.php?title=SocialEntity:11&oldid=764&diff=prev Error from line 21 of /var/www/bluespice/w/extensions/BlueSpiceVisualDiff/includes/HTMLDiffEngine.class.php: Call to a member function getId() on null

Backtrace:

#0 /var/www/bluespice/w/extensions/BlueSpiceVisualDiff/VisualDiff.class.php(226): HTMLDiffEngine->showDiffPage(NULL, Revision)
#1 /var/www/bluespice/w/includes/Hooks.php(177): VisualDiff->onArticleContentOnDiff(DifferenceEngine, OutputPage)
#2 /var/www/bluespice/w/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#3 /var/www/bluespice/w/includes/diff/DifferenceEngine.php(607): Hooks::run(string, array)
#4 /var/www/bluespice/w/includes/diff/DifferenceEngine.php(480): DifferenceEngine->renderNewRevision()
#5 /var/www/bluespice/w/includes/page/Article.php(737): DifferenceEngine->showDiffPage(boolean)
#6 /var/www/bluespice/w/includes/page/Article.php(464): Article->showDiffPage()
#7 /var/www/bluespice/w/includes/actions/ViewAction.php(68): Article->view()
#8 /var/www/bluespice/w/includes/MediaWiki.php(500): ViewAction->show()
#9 /var/www/bluespice/w/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title)
#10 /var/www/bluespice/w/includes/MediaWiki.php(818): MediaWiki->performRequest()
#11 /var/www/bluespice/w/includes/MediaWiki.php(524): MediaWiki->main()
#12 /var/www/bluespice/w/index.php(42): MediaWiki->run()
#13 {main}