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You can not setUndoManager to null (nil).
This fix is planned to be released with Xamarin.iOS 7.0.6, which should hit the beta channel before December 23rd.
I have verified this issue, following are the verified steps:
1. Created a sample iOS project.
2. Created a object of NSManagedObjectContext class and set null value in "UndoManager" property
3. Debug application application successfully.
Refer Screenshot: http://screencast.com/t/TYnld1KSnG
XS: 4.2.3 (Build 23)
X iOS: 18.104.22.168