Mon Oct 23 2017 10:09:02 UTC
Keep calm and do a clean rebuild.
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ID Product Comp Assignee Status Resolution Summary Changed
39507 Xamarin. Runtime bugzilla CONF --- Hard crash when overriding HasKeyEquivalentForEvent in NSMenuDelegate 2016-09-26
60065 Xamarin. Runtime rolf ASSI --- Make exception marshaling work with system mono 2017-10-09
53962 Xamarin. Runtime bugzilla REOP --- Setting return as a Key Equivalent for NSButton on Interface Builder does not produce desired result 2017-04-25
3 bugs found.

as

File a new bug in the "Runtime" component of the "Xamarin.Mac" product