ReferenceError: reason is not defined

## Error

```
reason is not defined
```

## Stack trace

```
/39da1535-fb5a-4fed-8f68-9faf8e5621a0:38 in free/<@blob:
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [ReferenceError: reason is not defined](https://thalamus-ai.sentry.io/issues/104622760/)
- **Culprit**: free/<@blob:(39da1535-fb5a-4fed-8f68)
- **First seen:** Mar 18, 2026