useField throw error "Cannot read property 'active' of undefined"

### Are you submitting a **bug report** or a **feature request**?

### What is the current behavior?
For lazy initial value's field, I'm using the useField for register filed after API loaded.
My code:

if (loading) return

```
Compo = (medias) => {
useField("attachmentFile", { initialValue: medias });
return null;
}
```

Error:

```
final-form.es.js:181 Uncaught (in promise) TypeError: Cannot read property 'active' of undefined
at publishFieldState (final-form.es.js:181)
at notifyField (final-form.es.js:739)
at notifyFieldListeners (final-form.es.js:750)
at notify (final-form.es.js:1082)
at afterPromise (final-form.es.js:712)
```

### What is the expected behavior?

### Sandbox Link
No

### What's your environment?
Ubuntu

### Other information