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Claude Code errors / Config

Stop hook error

platform: Claude Code / category: Config

Cause

Claude Code's hook output validator treats zero bytes of output as a missing JSON object and falsely reports a stop-hook failure, even when the hook exits 0.

Fix

Confirm the hook works by checking its exit code manually - the error is cosmetic for hooks that produce no output and exit 0. As a workaround, emit an empty JSON object from the hook: echo '{}'. Track the upstream fix in the linked issue.

Source thread →

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