Prime31 native toolkit - error with hide view controller

I have installed the Prime31 native toolkit and I use the function showViewControllerWithName to push a View that I created in Interface Builder on top of my Unity view.

This works perfectly and the IB View is showed on top of Unity. No problems here.

Then I decided to go one step further and create a button on my IB View that would dismiss the view again. I created the following method in my implementation file:

 - (IBAction)onTouchUnpause

{ [[NativeToolkit sharedManager] hideViewController]; }

and I connected the TouchUpInside action from my button to this method. This also works perfectly, as soon as I touch the button my IB View gets dismissed and I am back in my Unity view again.

But now comes the following situation; In my IB View I have created a UIPopOverController that I show, and as soon as this PopOver gets dismissed, I want to hide my IB View also.

So I made my IB View the delegate of the UIPopOverController, and I implemented the following:

 - (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController{
 
 NSLog(@"pop up dismissed!");
 [[NativeToolkit sharedManager] hideViewController];

}

the NSLog() is called, but after the hideViewController method, my app crashes!

I've debugged, and EVERY step from the hideViewController method is correctly executed, only after that I get this:

File: main.mm Line 21: UIApplicationMain(argc, argv, nil, @"AppController"); Error: thread 1 program received signal "EXC_BAD_ACCESS"

how is it possible that this error does not occur when I execute it after touching a button, but that it does occur after handling the popoverControllerDidDismissPopover event?