Desktop app crashes when backspacing past beginning of input prompt

Description

Claude Code desktop app crashes when the user backspaces too far (past the beginning) in the input prompt. The entire conversation is lost with no recovery option.

Steps to Reproduce

1. Open Claude Code desktop app
2. Type something in the input prompt
3. Press backspace repeatedly past the beginning of the input text
4. App crashes and the full conversation is lost

Expected Behavior

Backspacing past the beginning of input should be a no-op (do nothing), not crash the app.

Actual Behavior

The app crashes completely. The conversation cannot be recovered.

Environment

• Claude Code v2.1.97 (has also occurred on prior versions — this has been happening for a long time)
• Windows 11 Pro 10.0.26200
• Desktop app (not CLI)

Impact

This is a significant data loss issue. In the instance that prompted this report, the user lost a lengthy multi-hour conversation involving GCP infrastructure auditing with live API calls, agent-based codebase exploration, and generated analysis files. The conversation could not be resumed from where it left off.

Additional Context

The user reports this has been a recurring issue across multiple versions of Claude Code, not a one-time occurrence.