[BUG] Claude will go in an infinite loop if `~/.claude.json` is a folder

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?

When experimenting with mounting your Claude configurations into a Docker container, you may accidentally mount a folder as your ~/.claude.json file. If this happens, claude will crash instead of reporting a reasonable error message. The fact that it goes into an infinite loop is even wilder.

What Should Happen?

claude should just fail and say it's detected an issue with .claude.json and that it's not a file or something. It should not be stuck in an infinite loop though.

Error Messages/Logs

Exception in PromiseRejectCallback:
file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:3589
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RangeError: Maximum call stack size exceeded

Steps to Reproduce

mkdir claude-bug
docker run -it --rm -v $(pwd)/claude-bug:/root/.claude.json node:24 /bin/sh
npm i -g @anthropic-ai/claude-code
claude

It will now crash.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.120 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_