[BUG] Malformed UUID in ~/.claude.json crashes entire TUI on every keystroke

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?

A malformed or shortened UUID in the oauthAccount block of ~/.claude.json causes an unrecoverable crash on every keystroke in interactive mode. The application launches but crashes immediately upon any user input.

What Should Happen?

Graceful fallback — skip the telemetry metric or log a warning. The config file is user-editable and should tolerate malformed values without crashing the entire application.

Error Messages/Logs

https://gist.github.com/shauneccles/fd8ef0609c2ee8b087bb121076387f46

Steps to Reproduce

1. Edit ~/.claude.json
2. Set a short or empty string for accountUuid in the oauthAccount block (e.g. "accountUuid": "1")
3. Run claude
4. Type any character — application crashes

Note that organizationUuid does not crash but I am not part of an organisation - unsure if this is also exposed.

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.76 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_