I've never seen this with Core Data (unless you have the multithreading-violation argument set). I do see it with some of the AV frameworks, but those are C++

I've never seen this with Core Data (unless you have the multithreading-violation argument set). I do see it with some of the AV frameworks, but those are C++ exceptions, so as long as I only break on ObjC exceptions I don't hit it. Edit: I forgot 1 ObjC exception I see frequently from AVFoundation on macOS. That one does cause an annoying breakpoint hit.