I have a very simple application with a single view, containing several UILabels. Upon running in Simulator, the Xcode console returns the error:
libM
Ran into this when opening some project from GitHub on Xcode 10.0.
The pragmatic solution was: just hit 'Continue program execution' multiple times and probably disable your exception breakpoint. Apparently the exception was recoverable.
It's not a real solution but it was good enough for me at that point.