Flutter 我遇到了一个问题，从showDialogue()调用Navigator.pop()两次导致屏幕空白

我遇到了一个问题，从showDialogue()调用Navigator.pop()两次导致屏幕空白.我正在使用Auto_Router包.我该如何解决这个问题？

PopScope widget

 PopScope(
      canPop: false,
      onPopInvoked: (didPop) {
        log('on click back button ${MainApp.router.stack.toList()}');
        log('didPop: $didPop');
        if (didPop) {
          log('after pop ${MainApp.router.stack.toList()}');
          return;
        }
        _showBackDialog();
      },

showbackdialog function

void _showBackDialog() {
    showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          alignment: Alignment.bottomCenter,
          title: const Text('Are you sure?'),
          content: const Text(
            'Are you sure you want to leave this page?',
          ),
          actions: <Widget>[
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Nevermind'),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Leave'),
              onPressed: () async {
                Navigator.pop(context);
                Navigator.pop(context);
              },
            ),
          ],
        );
      },
    );
  }

Before Pop

After Pop

即使堆栈路径为空，路径也会继续弹出而不是退出应用程序.