Flutter/Ios - Firebase Phone auth using with FCM App crashes on real device only for first time

Everything works fine after the second time. this issue only occurs once per device, making it hard to debug.

Even if I restarted the device issue doesn't appear again but as it always happens for new users the first time.

AppDelegate.Swift

import UIKit
import Flutter
import flutter_downloader
import Firebase

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    FlutterDownloaderPlugin.setPluginRegistrantCallback(registerPlugins)
    if #available(iOS 10.0, *) {
      UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
    }
    if(!UserDefaults.standard.bool(forKey: "Notification")) {
        UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
        UserDefaults.standard.set(true, forKey: "Notification")
    }
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
   override func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        super.application(application, didReceiveRemoteNotification: userInfo, fetchCompletionHandler: completionHandler)
          let firebaseAuth = Auth.auth()
            Messaging.messaging().appDidReceiveMessage(userInfo)
            print(userInfo)
          if (firebaseAuth.canHandleNotification(userInfo)){
              completionHandler(.noData)
              return
          }
      }

}
private func registerPlugins(registry: FlutterPluginRegistry) {
    if (!registry.hasPlugin("FlutterDownloaderPlugin")) {
       FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin")!)
    }
}

Crash Log:

specialized AppDelegate.application(_:didReceiveRemoteNotification:fetchCompletionHandler:) + 600 (AppDelegate.swift:29)