Thread:Extension talk:MobileFrontend/LoginLink on MediaWiki 1.21 + MobileFrontend 121

If i switch to mobile frontend and click on the sysmbol right of the search input field a login button appears on the buttom of the page. But the link is incorrect.

http://familie-sparding.de/sannis_creawiki/index.php?title=Special:UserLogin?returnto=Hauptseite&returntoquery=article_action=watch

There is a ? after :UserLogin, and it must be a &.

Is this a bug or is it due to missconfig !?