I hope something like reverse debugging exists in an R. All you really need to do is write down the changes in variables at every step. str() would be best. Crash. Automatically highlight vars involved, and user can add more. Var change window moves highlighted vars to left. Keep scrolling up to catch whenever the NAs or structure changes show up first and there is my bug 2/3 times. Maybe this is called record-replay debugging. https://stackoverflow.com/questions/14159806/reverse-debugging-for-languages-other-than-c-c
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It's a wishlist item, really, but still a valid one.