Add null check when settling on LAST_TASK

Test: N/A
Fixes: 203237855
Change-Id: I511fde0ba3f22720ed1fe29769c97a3207a98a4b
diff --git a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
index e8aa2fa..8444261 100644
--- a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
+++ b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
@@ -961,8 +961,10 @@
                 } else {
                     mStateCallback.setState(STATE_RESUME_LAST_TASK);
                 }
-                TaskViewUtils.setSplitAuxiliarySurfacesShown(
-                        mRecentsAnimationTargets.nonApps, true);
+                if (mRecentsAnimationTargets != null) {
+                    TaskViewUtils.setSplitAuxiliarySurfacesShown(
+                            mRecentsAnimationTargets.nonApps, true);
+                }
                 break;
         }
         ActiveGestureLog.INSTANCE.addLog("onSettledOnEndTarget " + endTarget);