---
title: LanguageModelSession.Error.transcriptMutationWhileResponding
framework: foundationmodels
role: symbol
role_heading: Case
path: foundationmodels/languagemodelsession/error/transcriptmutationwhileresponding
---

# LanguageModelSession.Error.transcriptMutationWhileResponding

The session’s transcript was mutated while a request was in progress.

## Declaration

```swift
case transcriptMutationWhileResponding
```

## Discussion

Discussion Do not modify the transcript while a request is being processed.

## See Also

### Getting the session errors

- [LanguageModelSession.Error.concurrentRequests](foundationmodels/languagemodelsession/error/concurrentrequests.md)