/insights crashes with TypeError: v.split is not a function on v2.1.34

Bug Description

Running /insights immediately crashes with:

TypeError: v.split is not a function. (In 'v.split(`\n`)', 'v.split' is undefined)

This is a different crash from #23138 (Object.keys(b) on undefined). The workarounds from that thread (deleting corrupted facet files, pre-creating valid facet files for all sessions) do not resolve this issue.

Steps to reproduce

1. Run /insights from any directory (tried both git repos and non-git directories)

What was tried

• Pre-created valid facet files for all 1,402 sessions in ~/.claude/usage-data/facets/ — no effect
• Ran grep -l '"error":' ~/.claude/usage-data/facets/*.json | xargs rm -v — no corrupted files found
• Created ~/.claude/usage-data/facets/ directory manually — no effect
• Tried running from different working directories (git repo vs non-git) — no effect

Notes

• The error does not appear in the debug log at all, suggesting it crashes in the UI/rendering layer before any debug logging occurs
• The debug log only shows standard MCP startup errors and AxiosErrors unrelated to /insights

Environment Info

• Platform: darwin (macOS 24.3.0)
• Terminal: iTerm / CLI
• Version: 2.1.34

Related

• #23138 (similar but different crash path)