diff --git a/ui/action-bar/action-bar.ios.ts b/ui/action-bar/action-bar.ios.ts
index 6740b6950..95bd491e6 100644
--- a/ui/action-bar/action-bar.ios.ts
+++ b/ui/action-bar/action-bar.ios.ts
@@ -44,7 +44,7 @@ export class ActionBar extends common.ActionBar {
 
         // Find previous ViewController in the navigation stack
         var indexOfViewController = navController.viewControllers.indexOfObject(viewController);
-        if (indexOfViewController !== NSNotFound && indexOfViewController > 0) {
+        if (indexOfViewController < navController.viewControllers.count && indexOfViewController > 0) {
             previousController = navController.viewControllers[indexOfViewController - 1];
         }