[BUG] Web: "Send now" while Claude is working ends the turn with an error

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?

On claude.ai/code (web, cloud session), while Claude was in the middle of a response, I typed a new message and clicked "Send now". The running turn stopped with an error, and the work Claude was doing in that turn was lost.

What Should Happen?

The new message should be queued until the current turn finishes, or the app should clearly warn that "Send now" will interrupt the current turn. It should not end with an error.

Error Messages/Logs

[Request interrupted by user]

Steps to Reproduce

1. Open a Claude Code session on claude.ai/code (web).
2. Give Claude a task that takes a while.
3. While Claude is responding, type a message and click "Send now".
4. The current turn ends with an error / interruption.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.292 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_