If present two different Modal ViewController one by one, the second one can't dismiss

[zhenby]

Three ViewControllers in my project: RootViewController, FirstModalViewController, SecondModalViewController.

1. RootViewController present FirstModalViewController using DMCustomModalViewController;
2. Then FirstModalViewController present SecondModalViewController using DMCustomModalViewController too;
3. When SecondModalViewController dismiss, the app is stop in the RootViewController animation view, like this: