TypeError [ERR_HTTP_INVALID_HEADER_VALUE]: Invalid value "undefined" for header "X-AuthenticationSession"

I get following error with this code, not sure what I'm doing wrong..

const Avanza = require('avanza')
const avanza = new Avanza()

console.log(avanza)

var user = 'fellmanfilip'

avanza.authenticate({
  username: user,
  password: '***********',
  totpSecret: '****************************************'
}).then(async () => {
  console.log("Successfully authenticated for %s", user)
  console.log("Trying to fetch current positions for %s", user)
  const positions = await avanza.getPositions()
  console.log("Successfully fetched current positions for %s", user)
  console.log(positions)
}).catch(e => { console.log(`Failed to fetch current positions for ${user} due to\n`, e) })

PS C:\Users\ffellman\private_projects> node .\display_savings.js
Avanza {
  _events: [Object: null prototype] {},
  _eventsCount: 0,
  _maxListeners: undefined,
  _credentials: null,
  _socket: null,
  _authenticated: false,
  _authenticationSession: null,
  _authenticationTimeout: 1440,
  _pushSubscriptionId: null,
  _reauthentication: null,
  _customerId: null,
  _securityToken: null,
  _backOffTimestamps: {},
  _socketHandshakeTimer: null,
  _socketSubscriptions: {},
  _socketMonitor: null,
  _socketLastMetaConnect: 0,
  _adviceTimeout: 30000,
  _socketConnected: false,
  _socketMessageCount: 1,
  _socketClientId: null,
  [Symbol(kCapture)]: false
}
Successfully authenticated for fellmanfilip
Trying to fetch current positions for fellmanfilip
Failed to fetch current positions for fellmanfilip due to
 TypeError [ERR_HTTP_INVALID_HEADER_VALUE]: Invalid value "undefined" for header "X-AuthenticationSession"
    at ClientRequest.setHeader (node:_http_outgoing:647:3)
    at new ClientRequest (node:_http_client:284:14)
    at Object.request (node:https:360:10)
    at C:\Users\ffellman\private_projects\node_modules\avanza\dist\index.js:53:23
    at new Promise (<anonymous>)
    at request (C:\Users\ffellman\private_projects\node_modules\avanza\dist\index.js:52:10)
    at C:\Users\ffellman\private_projects\node_modules\avanza\dist\index.js:934:9
    at new Promise (<anonymous>)
    at Avanza.call (C:\Users\ffellman\private_projects\node_modules\avanza\dist\index.js:930:12)
    at Avanza.getPositions (C:\Users\ffellman\private_projects\node_modules\avanza\dist\index.js:600:17) {
  code: 'ERR_HTTP_INVALID_HEADER_VALUE'
}

fhqvst / avanza

TypeError [ERR_HTTP_INVALID_HEADER_VALUE]: Invalid value "undefined" for header "X-AuthenticationSession" #85