Torri FireBase Authentication EmberFire

Extending the ToriiFirebaseAdapter by the code below, results in an error: ember.debug.js:16905 Assertion Failed: You cannot pass undefined as id to the store's find method".

The find method is called from within the "_findOrCreateUser" (code pasted below), any help appreciated.

import Ember from 'ember';
import ToriiFirebaseAdapter from 'emberfire/torii-adapters/firebase';

export default ToriiFirebaseAdapter.extend({
  firebaseApp: Ember.inject.service(),
  store: Ember.inject.service(),
 
  /**
   * Executed after Firebase authentication.
   *
   * Find or create the user based on the Firebase `authData`
   *
   * @param  {Object} authData
   * @return {Promise<Object>} Updated session info
   */
  open(authData) {
    return this._findOrCreateUser(authData)
      .then((user) => {
        return { currentUser: user };
      });
  },

  /**
   * Fetch an existing Firebase auth session and place into `session.currentUser`
   *
   * @return {Promise<Object>} Updated session info
   */
  fetch() {
        let ref=this.get('firebaseApp');
    console.log(ref);
    let authData = ref.auth();

    if (!authData) {
      return Ember.RSVP.Promise.reject(new Error('No Firebase session found'));
    }

    return this._findOrCreateUser(authData)
      .then((user) => {
        return { currentUser: user };
      });
  },

  /**
   * Teardown a session. Remove the `session.currentUser`.
   *
   * @return {Promise<Object>} Updated session info
   */
  close() {
    this.get('firebaseApp').unauth();
    return Ember.RSVP.Promise.resolve({ currentUser: null });
  },

  /**
   * Find the user with the given `authData`, create if not found
   *
   * @param  {Object} authData
   * @return {Promise<Object>} The user
   */
  _findOrCreateUser(authData) {
    let store = this.get('store');

    return store.find('user', authData.uid)
      .catch(() => {
        let newUser = store.createRecord('user', this.extractUserProperties(authData));

        return newUser.save();
      });
  },

  /**
   * Extract the user properties from `authData` that you care about.
   *
   * @param  {Object} authData
   * @return {Object} An updated property hash
   */
  extractUserProperties(authData) {
    var name = 'Unknown';
    var provider = authData.provider;
    var userData = authData[provider];

    if (userData.displayName) {
      name = userData.displayName;
    } else if (userData.username) {
      name = userData.username;
    }

    return {
      id: authData.uid,
      name: name,
      email: userData.email || null
    };
  }
});