TypeError: Cannot read property 'show' of undefined

[lagershins]

Using Cypress v6.4.0 with Node v14.15.4 on Linux Mint (backed by Ubuntu 18.04), when clicking any link in the test output, eg. when an error occurs, clicking the "Learn more" link, causes Cypress/Electron to crash with the following error displayed on the terminal

(node:18762) electron: The default of contextIsolation is deprecated and will be changing from false to true in a future release of Electron.  See https://github.com/electron/electron/issues/23506 for more information
TypeError: Cannot read property 'show' of undefined
    at Object._launch (/home/user/.cache/Cypress/6.4.0/Cypress/resources/app/packages/server/lib/browsers/electron.js:193:17)
    at Object._launchChild (/home/user/.cache/Cypress/6.4.0/Cypress/resources/app/packages/server/lib/browsers/electron.js:189:17)
    at BrowserWindow.onNewWindow (/home/user/.cache/Cypress/6.4.0/Cypress/resources/app/packages/server/lib/browsers/electron.js:137:22)
    at Object.<anonymous> (/home/user/.cache/Cypress/6.4.0/Cypress/resources/app/packages/server/lib/gui/windows.js:192:36)
    at Object.emit (events.js:315:20)
    at Object.internalWindowOpen (electron/js2c/browser_init.js:181:2714)
    at Object.<anonymous> (electron/js2c/browser_init.js:157:11014)
    at Object.emit (events.js:315:20)

Steps to reproduce

1. clone https://github.com/lagershins/cypress-crash
2. npm install
3. npm run test
4. from Cypress window run 'graph_explorer_spec.ts' which will fail
5. in the test output on the left, click "Learn more" under the "ReferenceError" description
6. Cypress/Electron crashes

Addendum: seems to be specific to Cypress v6.4.0 as v6.3.0 does not crash.

Edit: for formatting

[jennifer-shehane]

I've opened a new issue here to track this bug: #14912