Grep tool crashes with 'Cannot read properties of undefined (reading map)' when using proxy
Resolved 💬 1 comment Opened Nov 22, 2025 by xerial Closed Nov 22, 2025
Claude Code Bug Report
Repository: https://github.com/anthropics/claude-code/issues
Title: Grep tool crashes with "Cannot read properties of undefined (reading 'map')" when using proxy
Summary
The Grep tool's result rendering function crashes when filenames is undefined in files_with_matches mode. This only occurs when using Claude Code through a proxy (like tdx claude).
Error Details
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