Seeing this error on translatewiki.net a lot lately. [no req] means that it is a command line request. First observed in 2016-01-17.
2016-01-20 08:13:32 translatewiki.net translatewiki_net-bw_: [90ee8af6] [no req] BadMethodCallException from line 933 of /srv/mediawiki/tags/2016-01-19_16:04:04/extensions/SemanticForms/includes/SF_AutoeditAPI.php: Call to a member function formHTML() on a non-object (null)
#0 /srv/mediawiki/tags/2016-01-19_16:04:04/extensions/SemanticForms/includes/SF_AutoeditAPI.php(115): SFAutoeditAPI->doAction()
#1 /srv/mediawiki/tags/2016-01-19_16:04:04/extensions/SemanticForms/specials/SF_FormEdit.php(92): SFAutoeditAPI->execute()
#2 /srv/mediawiki/tags/2016-01-19_16:04:04/extensions/SemanticForms/specials/SF_FormEdit.php(43): SFFormEdit->printForm(string, string, NULL)
#3 /srv/mediawiki/tags/2016-01-19_16:04:04/includes/specialpage/SpecialPage.php(384): SFFormEdit->execute(string)
#4 /srv/mediawiki/tags/2016-01-19_16:04:04/includes/specialpage/SpecialPageFactory.php(563): SpecialPage->run(string)
#5 /srv/mediawiki/tags/2016-01-19_16:04:04/includes/MediaWiki.php(280): SpecialPageFactory::executePath(Title, RequestContext)
#6 /srv/mediawiki/tags/2016-01-19_16:04:04/includes/MediaWiki.php(738): MediaWiki->performRequest()
#7 /srv/mediawiki/tags/2016-01-19_16:04:04/includes/MediaWiki.php(510): MediaWiki->main()
#8 /srv/mediawiki/tags/2016-01-19_16:04:04/index.php(43): MediaWiki->run()
#9 {main}