User blog comment:TOR/MediaWiki Upgrade/@comment-1854066-20120704034619/@comment-51098-20120704092402

Yes, Negref extension is not compatible with 1.19. I've contacted with author of extension and informed about issue (https://www.mediawiki.org/wiki/User_talk:Dantman#Negref.php_is_not_compatible_with_MediaWiki_1.19_16982). Meanwhile I will try to find solution.