The deployments fail with `Cannot read property 'url' of undefined`

I'm using the action [in my workflow](https://github.com/frontity/frontity.org/blob/51c62d6963dc5f93fd1eef4abea7708b299ddc13/.github/workflows/deploy-and-lighthouse.yml#L29-L34)

The deployments have started to fail with:

```
✖ fatal TypeError: Cannot read property 'url' of undefined
at /index.js:55:42
at processTicksAndRejections (internal/process/task_queues.js:97:5)
```

In fact you can see the result of the github action right here: https://github.com/frontity/frontity.org/pull/107/checks?check_run_id=676275381#step:7:8

There's nothing in the main `index.js` file for this action that seems to me indicate the source of this error so any clue on what that might be?