joomla/joomla-platform — pull request #792 by katalystsol (2012-01-24 17:24:06+00:00)
Title: Changed countMenuChildren reference from $query to $dbo. $query was gene...

...rating an undefined variable error notice and then a fatal error notice because it is not defined previously in that method. After changing that on my site, which I had just upgraded to 2.5.0, it started working again.