Alertify not properly dismissing, popping back to the previous fullscreen page.

[GwynmeTheos]

Hello, I"m currently having some trouble with implementing Alertify into our code. The following code is the request to our API to validate a user's document (details are obfuscated due to proprietary code).

void postRequestFunction() async {
    if (...) {
      showAlertDialog(context);
      ...URL cleanup code
      ...Document cleanup code
      try {
        // Send request code
        if (res.statusCode == 200) {
          Navigator.of(context, rootNavigator: true).pop();
          print(resBody);
          Navigator.push(context,
              MaterialPageRoute(builder: (context) => ValidarTokenSMS()));
        } else {
          Navigator.of(context, rootNavigator: false).pop();
          Alertify(
            content: body,
            context: context,
            isDismissible: true,
            title: title,
            alertType: AlertifyType.warning,
            buttonText: 'Ok',
            animationType: AnimationType.outToIn).show();
        }
      } catch (error) {
        await utils.reportError(error);
      }
    } else {
      Alertify(
        content: body,
        context: context,
        isDismissible: true,
        title: title,
        alertType: AlertifyType.warning,
        buttonText: 'Ok',
        animationType: AnimationType.outToIn)
      .show();
    }
  }

The problem that is happening is:

I'm entering the signup page. Then the user types in the stuff, it sends the request and we open a popup to say it's loading. It returns an error (intentional). The Alertify popup appears. I click the ok to dismiss, it pops me back to the login page, but doesn't pop the Alertify popup - continuing to click the ok throws FlutterErrors (for trying to pop a guy that is no longer in the widget tree). It does let me click outside the popup to dismiss it, though.