IPhone app crashes on device but not on simulator?

You are trying to access an object by casting it's format type incorrectly.

Turn on Zombies and Malloc Scribble (scheme diagnostics) and debug your app (either simulator or device or both). Likely you have a deallocated object you are working with. Random memory accesses may succeed or fail when you read (or write) via a deallocated object or pointer.

That's the most common reason for such inconsistent behavior.

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