commit 329a583aae2c878ddaed3a816f11cd804bb83fe8
author Jorim Jaggi <jjaggi@google.com> Thu Jan 05 18:57:12 2017 +0100
committer Jorim Jaggi <jjaggi@google.com> Wed Jan 18 13:41:09 2017 +0100
tree 67f44422820f8ff3abb4b4b5b9fc747e6f1d4ad4
parent 2ec59897cf892666146f378825d2adcf972248ac

Follow-up for I01e81b9cd11886da734da671c68d5732aa51009f

Test: Open app, press recents, make sure thumbnail is up-to-date
Bug: 31339431
Change-Id: I933ad05dbc46b7b71572b09d698524a9699c0fbf

services/core/java/com/android/server/wm/TaskWindowContainerController.java

diff --git a/services/core/java/com/android/server/wm/TaskWindowContainerController.java b/services/core/java/com/android/server/wm/TaskWindowContainerController.java
index 0ca1887..26e36dc 100644
--- a/services/core/java/com/android/server/wm/TaskWindowContainerController.java
+++ b/services/core/java/com/android/server/wm/TaskWindowContainerController.java
@@ -52,7 +52,9 @@
         public void handleMessage(Message msg) {
             switch (msg.what) {
                 case REPORT_SNAPSHOT_CHANGED:
-                    mListener.onSnapshotChanged((TaskSnapshot) msg.obj);
+                    if (mListener != null) {
+                        mListener.onSnapshotChanged((TaskSnapshot) msg.obj);
+                    }
                     break;
             }
         }