Last modified: 2010-05-15 15:42:52 UTC
There is a problem in SkinTemplate::makeTalkUrlDetails where under some circumstances a call to a member function on a non-object occurs:
$title = Title::newFromText( $name );
$title = $title->getTalkPage();
The call to Title::newFromText might return NULL but the code in makeTalkUrlDetails doesnt check it properly.
Actually im not sure how i ran into this but it locked out any users from logging into the wiki.
Probably IPv6 localhost... upgrade MediaWiki to a current version which does not suffer from that bug.