Odd error messages when modifying metadata

It's unknown what these messages mean exactly, other than they cause havoc if you're attempting to tag a large number of images at a time. You'll have to force quit Bridge since there's no other way to stop these messages from popping up without clicking on them one at a time. 


No pattern has been found, aside from perhaps they seem to be more prevalent with RAW files but that's not an absolute.


Any ideas?