It's The blog add-on from TaylorJ....
However, i went to uninstall it and now it's broken my entire forum....
So now i'm in the process of fixing it.....lol. I think it had something to do with elasticsearch (which I don't use)
Just poor coding on an add-on developer's part it would seem....or it could be conflicting with one of my other add-ons.
Regardless, I've uninstalled the add-on as it was seldomly used anyway.