[BUG] /insights command throws TypeError: undefined is not an object (evaluating 'Object.keys(b)')

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

The /insights slash command throws a TypeError every time it is executed. The error occurs both in the VS Code extension and in the CLI terminal.

Error message:
TypeError: undefined is not an object (evaluating 'Object.keys(b)')

Environment

• Claude Code version: 2.1.34
• OS: macOS (Apple Silicon / arm64) — MacBook Air 2024
• Installation method: Native
• VS Code extension version: 2.1.34 (anthropic.claude-code-2.1.34-darwin-arm64)

Observed Behavior

The command fails instantly with:
/insights
TypeError: undefined is not an object (evaluating 'Object.keys(b)')

What Should Happen?

This happens consistently on every attempt. Tried multiple times in both environments (VS Code integrated terminal and standalone terminal).

Expected Behavior

The /insights command should display session or usage insights without errors.

Additional Context

• The CLI was recently updated from 2.1.19 → 2.1.25 → 2.1.34. The error may be related to data format incompatibility between versions, as the older versions may have stored session/usage data in a different schema than what 2.1.34 expects.
• The /insights skill shows 4 usages in .config.json, all resulting in the same error.
• Other slash commands (e.g., /warmup) work correctly.

Screenshot

[Attach the screenshot showing the error in both VS Code and terminal]

<img width="1334" height="1102" alt="Image" src="https://github.com/user-attachments/assets/08ffb758-76f6-4967-a208-4b8d9866434e" />

Error Messages/Logs

TypeError: undefined is not an object (evaluating 'Object.keys(b)')

Steps to Reproduce

Steps to Reproduce

1. Open Claude Code (either via claude in terminal or via the VS Code extension)
2. Type /insights and press Enter
3. Error is displayed immediately

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.34

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_