NSNotificationCenter related crash on iOS 3.2

Our app works fine on iOS 4.2 and 4.3. However, on iOS 3.2 it crashes at this line

[[NSNotificationCenter defaultCenter] postNotificationName:@"notificnname" object:nil];

The function postNotificati开发者_运维技巧onName is available since iOS 2.0. I am building my app with iOS 4.3 and the target sdk is set as 3.2. Any ideas what could be causing the crash.

Thanks.

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agree with pt2ph8's comment above.

Mostly likely some object registered for a notification, then got dealloced without unregistering for a notification. Thus the notification center is sending notifications to dead objects.

Make sure in your dealloc (or viewDidUnload for view controllers) that you are unregistering that object from all notifications.