I try to add a native Splash Screen to my Flutter iOS App with this tutorial:

https://medium.com/@obenkucuk/flutter-native-splash-animation-with-lottie-on-ios-3c8660b41dde

I added to AppDelegate:

 // Runs the default Dart entrypoint with a default Flutter route.
    flutterEngine.run()
      
    // Used to connect plugins (only if you have plugins with iOS platform code).
    GeneratedPluginRegistrant.register(with: self.flutterEngine)

and my SplashViewController looks like:

import UIKit
import Lottie
import Flutter

public class SplashViewController: UIViewController {
    
    private var animationView: LottieAnimationView?
    
    public override func viewDidAppear(_ animated: Bool) {
        animationView = .init(name: "splash")
        animationView!.frame = view.bounds
        animationView!.contentMode = .scaleAspectFill
        animationView!.loopMode = .playOnce
        animationView!.animationSpeed = 1.00
        view.addSubview(animationView!)
        animationView!.play{ (finished) in
            self.startFlutterApp()
        }
    }
    
    func startFlutterApp() {
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        let flutterEngine = appDelegate.flutterEngine
        let flutterViewController =
            FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
        
        flutterViewController.modalPresentationStyle = .custom
        flutterViewController.modalTransitionStyle = .crossDissolve
        
        present(flutterViewController, animated: true, completion: nil)
        
    }
}

It is working but I have one Problem if I try to send a mail with the package flutter_email_sender. This error seems to be a problem with MFMailComposeViewController:

Attempt to present <MFMailComposeViewController: 0x1508ed800> on <Runner.SplashViewController: 0x147f131c0> (from <Runner.SplashViewController: 0x147f131c0>) which is already presenting <FlutterViewController: 0x14a25f800>.

This solution is not helping me:
/a/59336348/3037763

How could I modify my controller to work with MFMailComposeViewController as well?