While running my application on Mac with the native MenuBar, I ran into this exception that crashed completely my application.

Application Specific Information:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Item to be removed is not in the menu in the first place'
terminating with uncaught exception of type NSException
abort() called

I can provide the full report generated by Apple. This seems related to RT-26686 .