diff --git a/core/java/android/service/dreams/DreamActivity.java b/core/java/android/service/dreams/DreamActivity.java
index a2fa1392b0796..a3892238f1e6a 100644
--- a/core/java/android/service/dreams/DreamActivity.java
+++ b/core/java/android/service/dreams/DreamActivity.java
@@ -58,11 +58,13 @@ public class DreamActivity extends Activity {
             setTitle(title);
         }
 
-        final Bundle extras = getIntent().getExtras();
-        mCallback = (DreamService.DreamActivityCallbacks) extras.getBinder(EXTRA_CALLBACK);
-
-        if (mCallback != null) {
+        final Object callback = getIntent().getExtras().getBinder(EXTRA_CALLBACK);
+        if (callback instanceof DreamService.DreamActivityCallbacks) {
+            mCallback = (DreamService.DreamActivityCallbacks) callback;
             mCallback.onActivityCreated(this);
+        } else {
+            mCallback = null;
+            finishAndRemoveTask();
         }
     }