From ff02cd54d44ff5767264fca22a3926c9cb135f57 Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Wed, 14 Feb 2018 09:14:12 -0800
Subject: [PATCH] Skip updating displacement if handler is already invalidated.

Bug: 73338391
Change-Id: I091e8a682f95631e15b3f2cbe3e281c4f18003b9
---
 .../src/com/android/quickstep/WindowTransformSwipeHandler.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 9bcbf34cef..91f4453299 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -461,6 +461,9 @@ public class WindowTransformSwipeHandler extends BaseSwipeInteractionHandler {
 
         if (mLauncherTransitionController != null) {
             Runnable runOnUi = () -> {
+                if (mLauncherTransitionController == null) {
+                    return;
+                }
                 mLauncherTransitionController.setPlayFraction(shift);
 
                 // Make sure the window follows the first task if it moves, e.g. during quick scrub.