MT::App::CMS=HASH(0x8360d10) Use of uninitialized value in concatenation (.) or string at lib/MT/ObjectDriver/DBI.pm

The above error suddenly popped up in my installation. I've not made any changes (afaik) to have caused the error, but it appears to keep from displaying my Recent Comments in the sidebar (which worked fine up until last night).

Rebuilds on other blogs of this installation seem to work fine and do not give me an error like this. I'm assuming it's not liking the recent comments display for some reason, but looking through the last few comments isn't yielding me any info that would point to a cause for this error... so far.

*Edit : Yep, removed the calls for Recent Comments, rebuilt and no errors now.