TypeError: Cannot read properties of undefined (reading 'handle')

## Error

```
Cannot read properties of undefined (reading 'handle')
```

## Stack trace

```
../app/javascript/components/impact/map.tsx:87 in MetricPointInner
div
../app/javascript/components/impact/map.tsx:159 in MetricPoint
div
div
../app/javascript/components/impact/map.tsx:178 in map_default
Suspense
../node_modules/@sentry/react/src/errorboundary.tsx:101 in new ErrorBoundary
../node_modules/@tanstack/react-query/src/QueryClientProvider.tsx:30 in QueryClientProvider
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [TypeError: Cannot read properties of undefined (reading 'handle')](https://thalamus-ai.sentry.io/issues/98614926/)
- **Culprit**: MetricPointInner(app/javascript/components/impact/map)
- **First seen:** Feb 23, 2026