About 33% of login cases return Error 12501

About 33% of login cases return Error 12501, which I log with Sentry.
The error is triggered by:
googlePlusUser = await this.google.login(environment.googleParams)

I have so far been unable to reproduce this issue and the error happens on all major Android versions and devices. I am using Ionic4 with Firebase and the cordova-plugin-googleplus. https://github.com/EddyVerbruggen/cordova-plugin-googleplus

Note: Already have an unanswered issue ticket there and on stack-overflow.

Currently, the app is only available on Android.

import { GooglePlus } from '@ionic-native/google-plus/ngx';

providedIn: 'root',
export class FirebaseAuthService {
private google: GooglePlus,
private fireAuth: AngularFireAuth,
) { }

async loginGoogle(that: any): Promise {
let googlePlusUser;
try {
googlePlusUser = await this.google.login(environment.googleParams);

  return await firebase
    .then((response) => {
    .catch((error) => {
      console.log('inside loginGoogle then catch: ', error);
} catch (error) {
  console.log('outside loginGoogle then catch: ', error);


My environment googleParams are

googleParams: { 
webClientId: 'xxx.apps.googleusercontent.com', 
offline: false, 

I am at a loss of what the issue is and would be happy to add any further information if requested.