Cannot read property '__error' of null

As of version 4.6.0, Cypress has been throwing this exception during a very simple test that consists of

• Routing a request
• Logging in
• Visiting a page
• Make sure an element is displayed

This issue is reproducible with 4.7.0 version as well. It works perfectly fine in version 4.5.0. Here’s how to reproduce

1. Set baseUrl in cypress.json to: https://qa1-cypress.st.dev
2. Run the following test using either Cypress version 4.6.0 or later

it('Business Unit Test', () => {
    cy.server()
    cy.route({
      method: 'GET',
      url: '/Settings/GetBusinessUnits*',
      response: [{
        Id: 56345,
        Name: 'Test BU',
        OfficialName: 'Test BU',
        Active: true,
        Logo: null,
        PostDate: null,
        QbExportState: null
      }],
      status: 200
    })
    cy.request('POST', '/Auth/Login', { username: 'cydemoadmin', password: 'Test1@#$%' })
    cy.visit('/#/Settings/business-units')
    cy.get('.e2e-column-name').contains('Test BU').should('be.visible')
  })

Here’s a screenshot of the exception stack trace

[MorganNesbitt]

Same, tests that never had this now have it appearing all over the place. Cypress says it originates from our app but it doesnt seem like it is, or if it is its not appearing in a console anywhere.

[cypress-bot[bot]]

Released in 4.8.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to Cypress v4.8.0, please open a new issue.