Status code 0 when submitting form

[useo6]

I'm trying to test my register form, but I'm having some trouble. When submitting the form, Zombie tells me that a new window was opened:

zombie Submit form to http://localhost:58099/account/register +0ms
zombie Opened window http://localhost:58099/account/register +4ms

That's confusing me at the moment and furthermore, dumping the browser output to the console after submitting the form, shows me the following:

Zombie: 5.0.7
URL: http://localhost:58099/account/register

History:
1: http://localhost:58099/account/register
2: http://localhost:58099/account/register

Cookies:

Storage:
Document:

Event loop: waiting for true events
undefined

When I check the browser.statusCode, the code is 0... but... why 0? I would expect 200 or maybe 500, but not 0...

The code is the following:

describe('Checking /account/register', function () {
  const browser = new Browser({ site: 'http://localhost:58099', debug: true })

  before((done) => {
    browser.visit('/account/register', done)
  })

  describe('Check valid data...', () => {
    before((xDone_p) => {
      browser.debug()
      browser.fill('email', '[email protected]')
      browser.fill('acceptterms', 'on')
      browser.pressButton('Register', () => {
        console.log(browser.dump())
        xDone_p()
      })
    })

    it('test', () => {
      console.log(browser.statusCode)
      expect(browser.statusCode).to.be(200)
    })
  })
})

[useo6]

I'll close the ticket because all of the errors were on my side.