[BUG] Unhandled promise rejection crash in Ink rendering layer with invalid terminal dimensions

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 running claude, it crashes immediately with an unhandled promise rejection. The error points to the Ink terminal UI layer failing during render.

## What I think is happening

Looking at the minified code in the stack trace, I can see references to ink-box, ink-text, yogaNode, and layout calculations. The RangeError: Array length must be a positive integer suggests the output buffer is being
created with an invalid size - probably because the terminal is reporting 0 or negative dimensions.

The crash happens in:

• Ink's reconciler (onRender, unmount)
• Yoga layout engine (null yoga nodes)
• Buffer allocation with bad dimensions

What Should Happen?

Instead of crashing with a cryptic minified stack trace, it would be nice if Claude Code:

• Checked terminal dimensions before starting the UI
• Showed a clear error like "Your terminal has invalid dimensions, please resize or check your terminal settings"
• Had proper error handling around the Ink render loop

Error Messages/Logs

❯ claude
   This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:
   RuntimeError: access to a null reference (evaluating 'Y$.apply(null,gI)')
       at <anonymous> (/$bunfs/root/claude:702:6815)
       at <anonymous> (/$bunfs/root/claude:702:30854)

   RangeError: Array length must be a positive integer of safe magnitude.
         at get (/$bunfs/root/claude:790:8127)
         at onRender (/$bunfs/root/claude:811:6349)
         at unmount (/$bunfs/root/claude:811:7674)
         at emit (/$bunfs/root/claude:44:1608)

Steps to Reproduce

Not 100% sure, but likely running claude in a context where stty size returns 0 0 or the terminal doesn't report valid columns/rows."

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.51 (Claude Code)

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Other

Additional Information

Terminal: alacritty
System: Arch Linux with Hyperland