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Created attachment 14087 [details]
Repro Project - Xamarin.Mac
Steps to reproduce: Run attached sample project
public override NSView MakeView (string identifier, NSObject owner)
// if owner == null (and it is) throws NullArgumentException
return base.MakeView(identifier, owner);
Love it. The header itself says:
This method may also return a reused view with the same 'identifier' that was no longer available on screen. 'identifier' can not be nil.
But it is in this case....
Fixed in master / 89435f6bedc16f8a76a59223fd4e7cf6db87413e