diff --git a/services/core/java/com/android/server/wm/DisplayPolicy.java b/services/core/java/com/android/server/wm/DisplayPolicy.java
index bbfb3c5556575..cf87203893cf3 100644
--- a/services/core/java/com/android/server/wm/DisplayPolicy.java
+++ b/services/core/java/com/android/server/wm/DisplayPolicy.java
@@ -478,8 +478,10 @@ public class DisplayPolicy {
 
                     @Override
                     public void onSwipeFromRight() {
-                        final Region excludedRegion =
-                                mDisplayContent.calculateSystemGestureExclusion();
+                        final Region excludedRegion;
+                        synchronized (mLock) {
+                            excludedRegion = mDisplayContent.calculateSystemGestureExclusion();
+                        }
                         final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture
                                 || mNavigationBarPosition == NAV_BAR_RIGHT;
                         if (mNavigationBar != null && sideAllowed
@@ -490,8 +492,10 @@ public class DisplayPolicy {
 
                     @Override
                     public void onSwipeFromLeft() {
-                        final Region excludedRegion =
-                                mDisplayContent.calculateSystemGestureExclusion();
+                        final Region excludedRegion;
+                        synchronized (mLock) {
+                            excludedRegion = mDisplayContent.calculateSystemGestureExclusion();
+                        }
                         final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture
                                 || mNavigationBarPosition == NAV_BAR_LEFT;
                         if (mNavigationBar != null && sideAllowed