Merge "Add null pointer judgment processing to prevent restarting" into main

                false /* deferResume */);

        ActivityRecord topActivity = getDisplayArea().topRunningActivity();

        Task topRootTask = topActivity.getRootTask();

        Task topRootTask = topActivity == null ? null : topActivity.getRootTask();

        if (topRootTask != null && topRootTask != this && topActivity.isState(RESUMED)) {

            // Usually resuming a top activity triggers the next app transition, but nothing's got

            // resumed in this case, so we need to execute it explicitly.