[SOLVED] Thread 1: EXC_BAD_ACCESS (code=1, address=0xf00000c)

Thread 1: EXC_BAD_ACCESS (code=1, address=0xf00000c)

I have problem with Thread 1: EXC_BAD_ACCESS (code=1, address=0xf00000c) and I don't know how to resolve it. It appeared when I change some object in core date and save it and I try to pop this controller to parent. This error is in main() with retVal. here is some code

        int retVal;
    @try {
        retVal =  UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
           */\ error is here**
    }
    @catch (NSException *exception) {
        NSLog(@"%@", [exception callStackSymbols]);
        @throw exception;
    }
    return retVal;

After re-runing app all my changes are in core data. What is more this problem is only on iOS 7. iOS 6.1 is ok.

Does someone have idea how to resolve it?

Solution

As a comment said this error is likely to be deep in your code. If the culprit is a zombie, the easiest way to find it is to run it (preferably in the latest Xcode, currently Xcode 5, as it has been improved) in profiler and choose "Zombies". When it fails, you can see the history of everything that has happened to the object.

Also, set an exception breakpoint. You may get a break when the error happens instead of in main, where the exception gets passed up.