"No result found on Fave lookup." for https://loadaverage.org/notice/7815009 sounds more like there's an inconsistency in the database.

I think why you're seeing that message is because it's getting caught. It's likely not something that can be fixed but rather prevented in the future (i.e. something with a Fave dataobject not being found). I wonder if it could just be something that has been unfaved and not properly removed?