setViewControllers of UINavigationController crash app when use with animation:NO
<p>this is working very fine:</p>

<pre><code>[(UINavigationController*)viewController setViewControllers:[NSArray arrayWithObject:cvc] animated:YES];
</code></pre>

<p>But This cause my application to crash:</p>

<pre><code>[(UINavigationController*)viewController setViewControllers:[NSArray arrayWithObject:cvc] animated:NO];
</code></pre>

<p>the same line I have used in else part with different viewController with animation:NO and it is working fine. Am I missing something or it is a bug?</p>
