From f91dbf777dded9bee575a7362c496ef9c910f62d Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Wed, 18 Apr 2018 11:42:30 -0700
Subject: [PATCH] Fix NPE when deciding whether to defer task stack animation.

Bug: 78084664
Test: Just adding an NPE check
Change-Id: I1f07488c5b6e4ad4d1c528e35b7f6b9b00d1fb1b
---
 services/core/java/com/android/server/wm/TaskStack.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/services/core/java/com/android/server/wm/TaskStack.java b/services/core/java/com/android/server/wm/TaskStack.java
index ae9e80268741c..2e506ab476df8 100644
--- a/services/core/java/com/android/server/wm/TaskStack.java
+++ b/services/core/java/com/android/server/wm/TaskStack.java
@@ -1721,6 +1721,9 @@ public class TaskStack extends WindowContainer<Task> implements
             return true;
         }
         final Task homeTask = homeStack.getTopChild();
+        if (homeTask == null) {
+            return true;
+        }
         final AppWindowToken homeApp = homeTask.getTopVisibleAppToken();
         if (!homeTask.isVisible() || homeApp == null) {
             return true;