Error: Frame not initialized.

## Error

```
Frame not initialized.
```

## Stack trace

```
/v3:1
/v3:1
/v3:1
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [Error: Frame not initialized.](https://thalamus-ai.sentry.io/issues/144583571/)
- **Culprit**: ?(v3)
- **First seen:** Sep 2, 2026

Start with the linked Sentry report for “Frame not initialized” and compare its details with the `/v3` stack trace. No source file, test, or entry point is identified in the issue, so first locate the failing code path and establish a reproducible case. Done means the error is prevented or correctly handled and the reproduction no longer occurs.

Written by the indexing model from the issue text.