CLI Crash on Startup Due to Ink Rendering Error (TypeError: undefined is not an object evaluating 'B.code')

Description

Claude Code CLI crashes immediately on startup with a TypeError in the Ink rendering layer.

Environment

• Platform: Linux 6.1.0-40-amd64
• Date: 2025-10-25
• Trigger: CLI startup (first launch, not a restart)

Error Details

The crash occurs with the following error:

TypeError: undefined is not an object (evaluating 'B.code')
  at /$bunfs/root/claude:194:3100
  at map (native:1:11)
  at aYA (/$bunfs/root/claude:194:3093)
  at FzB (/$bunfs/root/claude:194:4206)
  at /$bunfs/root/claude:195:927
  at map (native:1:11)
  at get (/$bunfs/root/claude:195:784)
  at /$bunfs/root/claude:196:667
  at onRender (/$bunfs/root/claude:213:5546)
  at /$bunfs/root/claude:95:1901

Followed by:

error: Minified React error #327; visit https://reactjs.org/docs/error-decoder.html?invariant=327 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
  at xw (/$bunfs/root/claude:101:35146)
  at JI (/$bunfs/root/claude:99:4842)
  at VB0 (/$bunfs/root/claude:95:5022)
  at GB0 (/$bunfs/root/claude:95:5443)

Analysis

The error occurs in the Ink (React terminal UI) rendering layer, specifically during ANSI color code processing:

• Line 194: Color/theme code processing attempting to access B.code which is undefined
• This triggers during the onRender callback
• Cascades into React error #327 (related to setState/render issues)

Impact

• CLI requires restart to recover
• Happens during initial startup
• Complete crash, not a graceful error

Reproduction

Unknown - occurred during normal CLI startup. May be related to:

• Terminal emulator ANSI code support
• Theme/color configuration
• Specific terminal environment variables

Additional Context

User had a VitePress project open with custom.css file when the crash occurred, though it's unclear if this is related to the crash.