diff --git a/core/java/android/widget/PopupWindow.java b/core/java/android/widget/PopupWindow.java
index 72b70bc..de32c2b 100644
--- a/core/java/android/widget/PopupWindow.java
+++ b/core/java/android/widget/PopupWindow.java
@@ -1489,6 +1489,10 @@
         @Override
         public boolean dispatchKeyEvent(KeyEvent event) {
             if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
+                if (getKeyDispatcherState() == null) {
+                    return super.dispatchKeyEvent(event);
+                }
+
                 if (event.getAction() == KeyEvent.ACTION_DOWN
                         && event.getRepeatCount() == 0) {
                     KeyEvent.DispatcherState state = getKeyDispatcherState();