[BUG] VS Code extension crashes while rendering chat content: Cannot read properties of undefined (reading 'trim')

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Summary

The Claude Code VS Code extension intermittently fails to render chat content with:

Error rendering content: TypeError: Cannot read properties of undefined (reading 'trim')

Reloading the VS Code window temporarily clears the issue, but it comes back later.

Environment

• OS: Windows 11
• VS Code version: 1.112.0
• Claude Code extension version: claude opus 4.6

Behavior

• The chat panel sometimes crashes while rendering content
• The visible error is:

Error rendering content: TypeError: Cannot read properties of undefined (reading 'trim')


### What Should Happen?

Display normal rendering content

### Error Messages/Logs

```shell

Steps to Reproduce

Starting a conversation will bring it up.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.79.eld

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_