diff --git a/LMAlertView/CALayer+ModalAlert.m b/LMAlertView/CALayer+ModalAlert.m
index 085311c..9bbbf18 100644
--- a/LMAlertView/CALayer+ModalAlert.m
+++ b/LMAlertView/CALayer+ModalAlert.m
@@ -27,7 +27,7 @@ - (UIWindow *)windowForView:(UIView *)view
 {
 	UIView *tempView = view;
 	
-	while (tempView.superview != nil) {
+	while ([tempView respondsToSelector:@selector(superview)] && tempView.superview != nil) {
 		tempView = tempView.superview;
 		
 		if ([tempView isKindOfClass:[UIWindow class]]) {