diff --git a/services/core/java/com/android/server/wm/Transition.java b/services/core/java/com/android/server/wm/Transition.java
index 9d518df..ec3962c 100644
--- a/services/core/java/com/android/server/wm/Transition.java
+++ b/services/core/java/com/android/server/wm/Transition.java
@@ -228,7 +228,8 @@
     }
 
     @Nullable
-    static Transition fromBinder(@NonNull IBinder token) {
+    static Transition fromBinder(@Nullable IBinder token) {
+        if (token == null) return null;
         try {
             return ((Token) token).mTransition.get();
         } catch (ClassCastException e) {