App crash only on iPhone Device and not in Simulator?

All objects involved in array creation using initWithObjects should be actual objects. There is no enough code in your question to know if lat and longt are objects too. Are they?

In XCode, go to menu "edit scheme", choose the running configuration and add 'NSZombieEnabled' like in the picture below, when your apps crashes, it will provide you additional infos on the crash that should help you debug it.

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