Mysterious crash on iOS 8

Question

I\'m getting a lot of crash reports on iOS 8 with this stack trace:

Date/Time:       2014-09-17T20:26:15Z
OS Version:      iPhone OS 8.0 (12A365)
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Answer 1

Setting background image for navigationBar may also cause the crash on iOS8 when the app is lunched:

[self.navigationBar setBackgroundImage:[UIImage imageNamed:imgName] forBarMetrics:UIBarMetricsDefault];

According to Apple documents, may be i should customize the navigationBar in

- (void)applicationDidBecomeActive:(UIApplication *)application {
     // customize the navigationBar only once 
     ...
}

But i think it is poor.