Cannot read properties of undefined (reading 'currentPageId')
Hey, I ran into an error while using tldraw:

```js
TypeError: Cannot read properties of undefined (reading 'currentPageId')
    at Editor.getCurrentPageId (http://localhost:3001/static/js/bundle.js:69909:35)
    at __UNSAFE__Computed.__unsafe__getWithoutCapture (http://localhost:3001/static/js/bundle.js:88682:27)
    at haveParentsChanged (http://localhost:3001/static/js/bundle.js:89216:22)
    at __UNSAFE__Computed.__unsafe__getWithoutCapture (http://localhost:3001/static/js/bundle.js:88668:323)
    at haveParentsChanged (http://localhost:3001/static/js/bundle.js:89216:22)
    at __UNSAFE__Computed.__unsafe__getWithoutCapture (http://localhost:3001/static/js/bundle.js:88668:323)
    at haveParentsChanged (http://localhost:3001/static/js/bundle.js:89216:22)
    at __UNSAFE__Computed.__unsafe__getWithoutCapture (http://localhost:3001/static/js/bundle.js:88668:323)
    at haveParentsChanged (http://localhost:3001/static/js/bundle.js:89216:22)
    at __EffectScheduler__.maybeScheduleEffect (http://localhost:3001/static/js/bundle.js:88892:97)
```

My browser: Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Mobile Safari/537.36