TypeError: Cannot read properties of undefined (reading 'length')
- Dominant language
- Ruby
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- 548
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- 28
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:2889 in DocView.updateChildren
../node_modules/@codemirror/view/dist/index.js:2827 in DocView.updateInner
../node_modules/@codemirror/view/dist/index.js:2817 in DocView.update
../node_modules/@codemirror/view/dist/index.js:7566 in EditorView.update
../node_modules/@codemirror/view/dist/index.js:7465 in this.dispatchTransactions
../node_modules/@codemirror/view/dist/index.js:7489 in EditorView.dispatch
../node_modules/@codemirror/view/dist/index.js:7233 in this.handlers.textformatupdate
../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/105980173/)
- **Culprit**: ChildCursor.findPos(@codemirror/view/dist/index)
- **First seen:** Mar 22, 2026
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