cypress: window.Cypress is undefined

• Operating System: OS-X 10.12.5
• Cypress Version: 1.1.2
• Browser Version: Chrome 62.0.3202.94

Is this a Feature or Bug?

bug

Current behavior:

Cypress randomly crashes after visiting website. (cy.visit('https://url'))

Desired behavior:

It would be nice without the crash 😄

Test code:

Cypress.Cookies.debug(true);
Cypress.Cookies.defaults({
  whitelist: cookieName,
});
// -- This is a parent command --
Cypress.Commands.add(
  'login',
  (username, password) => {
    cy.request(`${domain}netcenter/nacJS/loadNacProfilesV2`).then(response => {
      if (response.redirects) {
        cy.visit(domain);
        cy.get('#login').click();
        cy.get('#username').type(username);
        cy.get('#password').type(password);
        cy.get('#submit').click();
        cy.getCookie(cookieName).then(c => {
          cy.setCookie(cookieName, c.value, {
            domain: 'localhost',
            secure: false,
          });
        });
      }
    });
  },
);

Additional Info (images, stack traces, etc)

home:4 Uncaught Error: Something went terribly wrong and we cannot proceed. We expected to find the global Cypress in the parent window but it is missing!. This should never happen and likely is a bug. Please open an issue! at home:4