[BUG] /insights crashes with exit code 3221226505 on Windows`

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?

Bug Description

Running /insights crashes Claude Code with exit code 3221226505 (0xC0000409 - STATUS_STACK_BUFFER_OVERRUN).

Steps to Reproduce

1. Open Claude Code (CLI or VS Code extension)
2. Run /insights
3. Process crashes immediately

Environment

• Claude Code v2.1.86 (both CLI and VS Code extension)
• Windows 11 Pro 10.0.26200
• Node v24.12.0 (also tested with v22.22.2 — same crash)
• Crash occurs in both CLI and VS Code extension

Expected Behavior

Insights dashboard should display usage data.

Actual Behavior

Process exits with code 3221226505 (0xC0000409).

VS Code log shows:
2026-03-28 13:01:25.319 [error] Error from Claude (on channel ffanwenejfa): Error: Claude Code process exited with code 3221226505

What Should Happen?

/insights should display the usage insights dashboard without crashing

Error Messages/Logs

Session title at crash: "Generate insights dashboard data"

Steps to Reproduce

1. Open Claude Code (CLI or VS Code extension) on Windows
2. Run /insights
3. Process crashes immediately with exit code 3221226505

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.86

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_