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    initializePushNotificationのやつ

    E/flutter (32449): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Null check operator used on a null value
    E/flutter (32449): #0      MethodChannelFirebaseMessaging.registerBackgroundMessageHandler (package:firebase_messaging_platform_interface/src/method_channel/method_channel_messaging.dart:180:53)
    E/flutter (32449): #1      FirebaseMessagingPlatform.onBackgroundMessage= (package:firebase_messaging_platform_interface/src/platform_interface/platform_interface_messaging.dart:102:16)
    E/flutter (32449): #2      FirebaseMessaging.onBackgroundMessage (package:firebase_messaging/src/messaging.dart:73:31)
    E/flutter (32449): #3      FCMConfig.init (package:fcm_config/src/io/fcm_config.dart:122:25)
    E/flutter (32449): <asynchronous suspension>
    E/flutter (32449): #4      PushNotificationUtil.initializePushNotification (package:laughter/utils/push_notification.dart:33:5)
    E/flutter (32449): <asynchronous suspension>
    E/flutter (32449): #5      Future.wait.<anonymous closure> (dart:async/future.dart)
    E/flutter (32449): <asynchronous suspension>
    E/flutter (32449): #6      _FutureBuilderState._subscribe.<anonymous closure> (package:flutter/src/widgets/async.dart)
    E/flutter (32449): <asynchronous suspension>