From d99384d06739b7894ccac5ca4ad49648b93927dc Mon Sep 17 00:00:00 2001
From: Craig Mautner <cmautner@google.com>
Date: Mon, 14 Oct 2013 07:09:18 -0700
Subject: Add null check when determining mOnTopOfHome

Fixes bug 11198896.

Change-Id: I7b35c8a7156f03f8dab0598b55ef327e593f6427
---
 services/java/com/android/server/am/ActivityStack.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index d1c313a15f45..40ce8493d9e1 100644
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -1629,10 +1629,12 @@ final class ActivityStack {
     private void insertTaskAtTop(TaskRecord task) {
         // If this is being moved to the top by another activity or being launched from the home
         // activity, set mOnTopOfHome accordingly.
-        final boolean fromHome = mStackSupervisor.getLastStack().isHomeStack();
+        ActivityStack lastStack = mStackSupervisor.getLastStack();
+        final boolean fromHome = lastStack == null ? true : lastStack.isHomeStack();
         if (!isHomeStack() && (fromHome || topTask() != task)) {
             task.mOnTopOfHome = fromHome;
         }
+
         mTaskHistory.remove(task);
         // Now put task at top.
         int stackNdx = mTaskHistory.size();
-- 
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