react-native-fcm: Getting Duplicate Notifications (tested on Android)

Hi,

I’m getting duplicate notifications on Android (haven’t tested ios). My code is quite simple since I’m just starting out:

export default class NotificationService {
    static initHandler() {
      FCM.on(FCMEvent.Notification, async (notification) => this._handleNotification(notification));
    }
    static _handleNotification(notification) {
      console.log("Got " + notification.messageId);
    }
}

and in App.js

NotificationService.initHandler();
export const App = StackNavigator({
  Login: {screen: Login}
});

When I push a message from the backend service I get the same alert on the phone multiple times. I also keep getting previous alerts. The backend is not the problem. I checked that the backend is sending each notification once and I have the same app implemented 100% in Kotlin which works perfectly.

I’m fairly certain that I’m not registering multiple handlers since I checked that initHandler() is only called once. I’m very new to RN, am I doing something wrong or is there a known issue?

• versions: “react-native-fcm”: “^11.0.2” and “react-native”: “0.51.0”,
• Device: Samsung S8, Android 7.0
• This happens no matter what the app state is, foreground, background or stopped (cleared from task list).

Thanks!