C:/Program Files/Git/insights command crashes with null/undefined object error

Bug Description

The /insights command consistently crashes with a null/undefined object error.

Error Messages

The error message varies but indicates the same root cause:

• TypeError: undefined is not an object (evaluating 'Object.keys(h)')
• TypeError: Object.entries requires that input parameter not be null or undefined

Environment

• Claude Code Version: 2.1.31
• OS: Windows 11 (MINGW64_NT-10.0-22621)
• Platform: Git Bash / MSYS2

Reproduction Steps

1. Run /insights command in Claude Code
2. Error occurs immediately

Investigation Findings

During extensive debugging, I discovered:

1. Corrupted Usage Data File:

• File path: ~/.claude/usage-data/facets/b177a99f-f7c6-4b0f-87b2-ada3534538b6.json
• This file is repeatedly written with API error responses instead of valid session data:

``json
{
"type": "error",
"error": {
"type": "invalid_request_error",
"message": "The request body is not valid JSON: no low surrogate in string: line 1 column 26123 (char 26122)"
},
"request_id": "req_011CXpxk4q5fb18nfQ2rTzdz",
"session_id": "b177a99f-f7c6-4b0f-87b2-ada3534538b6"
}
``

1. Root Cause:

• A background process continuously tries to process session b177a99f-f7c6-4b0f-87b2-ada3534538b6
• The API request contains invalid UTF-16 characters (no low surrogate)
• Error responses are written to the usage data directory
• The /insights command attempts to aggregate these files but lacks null checks

1. Missing Null Check:

• The error Object.keys(h) or Object.entries indicates variable h is undefined
• Suggests the code doesn't validate data structure before accessing properties

Attempted Fixes (None Worked)

1. ✗ Deleted corrupted file → Immediately recreated with same error
2. ✗ Replaced with valid JSON structure → Overwritten by error response
3. ✗ Set file to read-only (chmod 444) → Error persists
4. ✗ Cleared entire usage-data/facets/ directory → New error files created
5. ✗ Deleted stats-cache.json → No effect

Expected Behavior

The /insights command should:

• Handle corrupted or invalid usage data gracefully
• Show a warning instead of crashing
• Skip problematic files or sessions

Suggested Fix

Add null/undefined checks before calling Object.keys() or Object.entries() on parsed usage data:

// Before
const keys = Object.keys(h);

// After
const keys = h ? Object.keys(h) : [];

Workaround

Currently, there is no effective workaround. The command is unusable.

Impact

• Low severity (non-essential feature)
• Does not affect core Claude Code functionality
• Only impacts usage statistics viewing