diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index e475eb6e992c0..937f2f1c1a2e2 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -4841,6 +4841,7 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
                 // If there is no resumed activity, it will choose the pausing or focused activity.
                 : mRootWindowContainer.getTopResumedActivity();
         mTopApp = top != null ? top.app : null;
+        if (mTopApp == mPreviousProcess) mPreviousProcess = null;
     }
 
     /**