TypeError: Cannot read property 'registerVoipToken' of null

[kumailSFS]

Issue lies at whenever i tries invoke VoipPushNotification?.registerVoipToken(); in my code it gives me error Cannot read property 'registerVoipToken' of null at package index.js line 95 RNVoipPushNotificationManager.registerVoipToken(); and app crashed. i tried to find solution but didn't found any solution.

node_modules/react-native-voip-push-notification/index.js

    static registerVoipToken() {
        RNVoipPushNotificationManager.registerVoipToken();
    }

Issue is on android only, in ios working fine. I'm using legacy project