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I developed an ios app that had a:
NSError *error;
instead of:
NSError *error = nil;
It worked fine in while I was debugging in the simulator and debugging on the device while connected. The moment I archived it and sent it into TestFlight to deploy for testing, I started getting Unknown Signal errors coming up in the crash log.
Why does this happen?
This happens because you have an uninitialized pointer. It does not crash as long as you get lucky, but using such pointers is undefined behavior.