App crashes when closed while receiving notification about react-native-gcm-android HOT 5 OPEN

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    Bundle bundle = intent.getBundleExtra("bundle");
    Object result = bundle.get("info");
    String data   = result.toString();
    String id     = bundle.get("google.message_id").toString();
    try{
        JSONObject jsonObj = new JSONObject(data);
        Log.d(TAG,"onStartCommand jsonObj => :"+jsonObj);
        Log.d(TAG,"onStartCommand bundle => :"+bundle);
        String message = jsonObj.getString("message");
        String subject = jsonObj.getString("subject");
        Integer notificationId = Integer.parseInt(id.substring(0, 10).replaceAll("[\\D]", ""));

        NotificationAttributes attributes = new NotificationAttributes();
        attributes.delayed = false;
        attributes.scheduled = false;
        attributes.autoClear = true;
        attributes.inboxStyle = false;
        attributes.priority = 2;
        attributes.sound = "default";
        attributes.smallIcon = "ic_launcher";
        attributes.message = message;
        attributes.subject = subject;
        Notification notification = new Notification(this, notificationId, attributes);
        notification.create();

    }catch (JSONException e) {
       Log.d(TAG,e);
    }  
    return START_NOT_STICKY;
}