diff --git a/PSTAlertController/PSTAlertController.m b/PSTAlertController/PSTAlertController.m
index 489a75f..f1d23b0 100644
--- a/PSTAlertController/PSTAlertController.m
+++ b/PSTAlertController/PSTAlertController.m
@@ -287,6 +287,9 @@ - (void)showWithSender:(id)sender arrowDirection:(UIPopoverArrowDirection)arrowD
 
             // Use the frontmost viewController for presentation.
             while (controller.presentedViewController) {
+                if([controller.presentedViewController isBeingDismissed]) {
+                    break;
+                }
                 controller = controller.presentedViewController;
             }