What is causing NSNull length unrecognized selector keyCommand error

Question

I have this class/storyboard scene in a project that up to last night worked fine for the past 4 weeks i worked on it.

I have managed to comment out practically ever

Answer 1

Ok I deleted the navigation controllers and tab bar controller and re-added them, and the problem is gone! There are no more crashes when I type in data. It was obviously a corrupted scene but the weird thing is that all of a sudden, all scenes with uitextfields got corrupted in the same way.

I'd like to add that advanced SO users should really take the time to talk to users posting issues before they down vote. Or users should then be allowed to up-vote the question back because it's really unfair that some people jump to conclusions and start down voting to a question that is actually a valid issue.