removing UIViewController after a push is crashing my app

Question

Hello,

I have a UIViewController which I push on my appDelegate.navigationController using : [appDelegate.navigationController pushViewController:initialLoadingController animated:YES];

This controller is getting data from network and displays a splash screen during this task. When the task is complete I push a new controller which is mainViewController.

All is ok. When the mainView is displayed I release initialLoadingController and after my app crashes when I try to push another controller. Don't remember the message but it seems that the navigationController is unable to find the released viewController in the array.

Do you have an idea ?

Thanks a lot