Bug: app errors cause Cypress tests to fail

[BCerki]

Describe the bug
Cypress tests occasionally fail due to uncaught exception errors:

To Reproduce
Comment out these lines from Cypress index.js:

Cypress.on('uncaught:exception', (err, runnable) => {
    // returning false here prevents Cypress from
    // failing the test
    return false
  })

Run the Cypress tests until the uncaught exception fails one of them (which one fails and where is inconsistent).

Expected behavior
There should be no errors in the app code.

Additional context
none