addTimer: causing SIGABRT?

In xcode

timer = [NSTimer timerWithTimeInterval:auto_panic_upadte_secs 
                            invocation:panicPendingTickInvoc开发者_如何学Cation repeats:FALSE];

[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

It gets past these lines of code, But as soon as I run it just SIGABRTs without/before my invocation happening.

Any idea to do this?

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You may need to retain the arguments to your NSInvocation with the method

[panicPendingTickInvocation retainArguments];

To stop and autoreleased arguments from being released before you timer firers.