FCM callback is running twice in iOS when app is in Foreground

In my app I am using FCM callback to show notification when app is in Foreground as below
componentDidMount() {
this.notificationListener = FCM.on(FCMEvent.Notification, async (notif) => {

if (Platform.OS === 'ios') {

switch(notif._notificationType){
case NotificationType.Remote:
notif.finish(RemoteNotificationResult.NewData) //other types available: RemoteNotificationResult.NewData, RemoteNotificationResult.ResultFailed
break;
case NotificationType.NotificationResponse:
notif.finish();
break;
case NotificationType.WillPresent:
notif.finish(WillPresentNotificationResult.All) //other types available: WillPresentNotificationResult.None
break;
}
if (notif.aps.alert.body) {
FCM.setBadgeNumber(this.props.notificationCount+1);
this.props.addNotification(notif.aps.alert.body);
//alert(notif.aps.alert.body);
Alert.alert(
'Notification',
notif.aps.alert.body,
[
{text: 'OK', onPress: () => console.log('OK Pressed')},
],
{ cancelable: false }
)
return
}

} else {
if (notif.fcm.body) {
this.props.addNotification(notif.fcm.body);
//alert(notif.fcm.body);
Alert.alert(
'Notification',
notif.fcm.body,
[
{text: 'OK', onPress: () => console.log('OK Pressed')},
],
{ cancelable: false }
)
return
}

}
});
}
componentWillUnmount() {
this.notificationListener.remove();
}

And above code is showing me alert for notification twice so its triggering twice.

Please check below information as well

1. What version of RN and react-native-fcm are you running?
"react-native": "^0.48.3","react-native-fcm": "^10.0.3",
2. What device are you using? (e.g iOS9 emulator, Android 6 device)?
iPhone 6s Plus
3. Is your app running in foreground, background or not running?
Foreground.

Please provide solution ASAP