[BUG] claude --resume crashes with undefined is not an object when session contains diff metadata with missing filePath

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?

aclaude --resume crashes with undefined is not an object (evaluating 'H.startsWith') at cljs:822848:/ when the session JSONL contains structuredPatch/diffPatch metadata with an undefined filePath property.

The crash occurs in function Q0K({filePath:H, structuredPatch:$, originalFile:q}) which calls H.startsWith(J0()) without null-checking H. When a session's diff metadata has a missing or undefined filePath, the TUI renderer crashes and the entire session becomes unresumable.

What Should Happen?

aclaude --resume should gracefully handle session JSONL files that contain structuredPatch/diffPatch metadata with a missing or undefined filePath. The fix would be a simple optional chaining check (H?.startsWith instead of H.startsWith) in the Q0K function, so that sessions with malformed diff metadata can still be resumed without crashing the TUI renderer.

Error Messages/Logs

Steps to Reproduce

a1. Have a long Claude Code session with multiple file edits (Edit tool calls)

1. Session completes normally
2. 3. Run claude --resume to resume the session
3. 4. Claude crashes with: undefined is not an object (evaluating 'H.startsWith')

The session JSONL file contains structuredPatch/diffPatch entries where the filePath property is undefined. This causes the TUI renderer to crash when trying to call .startsWith() on an undefined value.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.86 (Claude Code)

Platform

AWS Bedrock

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_