TypeError: Cannot read properties of null (reading 'map')
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Beschreibung
## Error
```
Cannot read properties of null (reading 'map')
```
## Stack trace
```
../app/javascript/components/common/TrackSlugsMultiselector.tsx:11 in TrackSlugsMultiselector
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 null (reading 'map')](https://thalamus-ai.sentry.io/issues/112093932/)
- **Culprit**: formatTags(app/javascript/components/common/TrackSlugsMultiselector)
- **First seen:** Apr 15, 2026
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