Core Data error 133020: problems merging in a save:

Question

First off I want to say that I am not using threads or multiple contexts and I have read and worked from every related answer I could find on SO. I have a project which I have a

Answer 1

I'm still not really sure what caused this but the issue reoccurred and I solved it by ensuring that any methods that referenced core data were executed on the main thread using performSelectorOnMainThread.