TypeError: Cannot read properties of undefined (reading 'length')
- Dominant language
- Ruby
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Description
## Error
```
Cannot read properties of undefined (reading 'length')
```
## Stack trace
```
../node_modules/@codemirror/view/dist/index.js:627 in ChildCursor.findPos
../node_modules/@codemirror/view/dist/index.js:575 in ContentView.childPos
../node_modules/@codemirror/view/dist/index.js:3119 in DocView.coordsForChar
../node_modules/@codemirror/view/dist/index.js:8078 in EditorView.coordsForChar
../node_modules/@codemirror/view/dist/index.js:7214 in this.handlers.characterboundsupdate
../node_modules/@sentry/browser/src/helpers.ts:117 in sentryWrapped
```
## Tracking Details
- **Project**: exercism-js
- **Sentry**: [TypeError: Cannot read properties of undefined (reading 'length')](https://thalamus-ai.sentry.io/issues/94843440/)
- **Culprit**: ChildCursor.findPos(@codemirror/view/dist/index)
- **First seen:** Feb 10, 2026
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