Fix crash when user is both scrolling and tabbing through Recents. (Bug 18552776)
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
index 2623db3..33a36f6 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
@@ -530,11 +530,12 @@
 
     /** Resets the focused task. */
     void resetFocusedTask() {
-        if ((mStack != null) && (0 <= mFocusedTaskIndex) &&
-                (mFocusedTaskIndex < mStack.getTaskCount())) {
+        if ((0 <= mFocusedTaskIndex) && (mFocusedTaskIndex < mStack.getTaskCount())) {
             Task t = mStack.getTasks().get(mFocusedTaskIndex);
             TaskView tv = getChildViewForTask(t);
-            tv.unsetFocusedTask();
+            if (tv != null) {
+                tv.unsetFocusedTask();
+            }
         }
         mFocusedTaskIndex = -1;
     }