Interesting there my friend! HMM have you made any recent changes that would help here?
The line your referring to has to do with caching gallery moderators
Content visible to verified customers only.
This is taken right from our latest code. Have you changed any moderators done anything of the sort as far as actions so I can test and see if I can get this error?
Try running the vbgallery install script and select the update settings cache and see if this helps as well.