diff --git a/Pod/Classes/UIAlertController+Window.m b/Pod/Classes/UIAlertController+Window.m
index f7221ce..a4c75b9 100644
--- a/Pod/Classes/UIAlertController+Window.m
+++ b/Pod/Classes/UIAlertController+Window.m
@@ -36,6 +36,10 @@ - (void)show {
 }
 
 - (void)show:(BOOL)animated {
+    if (self.presentingViewController) {
+        return;
+    }
+    
     self.alertWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
     self.alertWindow.rootViewController = [[UIViewController alloc] init];
     self.alertWindow.windowLevel = UIWindowLevelAlert + 1;