Runner shows white page when switching from Settings to Test

[bvanderneut]

Tested on version 5.6.0
Windows

How to reproduce:

1. Open the runner
2. Click on an test so it starts to run
3. Click to the settings options
4. Click back to to Tests
5. Now you get an white page and need to close the runner

[dzschille]

Same here with v5.6.0 running on Ubuntu. That's the console output when the error happens:

[82733:1110/125144.039800:INFO:CONSOLE(45293)] "TypeError: Cannot read property 'specType' of undefined", source: file:///home/user/.cache/Cypress/5.6.0/Cypress/resources/app/packages/desktop-gui/dist/app.js (45293)
[82733:1110/125144.039902:INFO:CONSOLE(45343)] "Uncaught TypeError: Cannot read property 'specType' of undefined", source: file:///home/user/.cache/Cypress/5.6.0/Cypress/resources/app/packages/desktop-gui/dist/app.js (45343)

[bahmutov]

Thank you @bvanderneut I can recreate from the steps. Running from develop gives the stack

The this.selectedSpec is the problem here

By clicking on "Settings" then back to "Tests" tab we recreate the specs list component, which resets the property.

[cypress-bot]

The code for this is done in cypress-io/cypress#9160, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 6.0.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v6.0.0, please open a new issue.