[BUG]

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?

When sending any message in Claude Code VS Code extension panel, the response area shows:
"API Error: undefined is not an object (evaluating 'Z.map')"

Claude does not respond to any message. The terminal shows Claude initializes successfully but the UI fails to render the response.

What Should Happen?

Claude should respond normally to messages sent via the VS Code extension panel.

Error Messages/Logs

API Error: undefined is not an object (evaluating 'Z.map')

Steps to Reproduce

1. Open Claude Code extension in VS Code panel
2. Type any message (e.g. "hi")
3. Press send
4. Error appears: "API Error: undefined is not an object (evaluating 'Z.map')"
5. No response is generated

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.44

Claude Code Version

2.1.45

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

• Using API Usage Billing via Organization account
• Terminal shows successful initialization and welcome screen
• Session resume command is generated, meaning session starts but response rendering fails
• The error 'Z.map' indicates minified bundle tries to call .map() on undefined API response