[Bug] Previous session becomes unresponsive when opening new session in same project

Bug Description
When opening a new Claude Code session in the same project, the previous session becomes unresponsive. Claude gets stuck processing, and after pressing escape, any new commands typed are not acknowledged. The prompt shows as > with a dark grey background, but Claude does not respond to any input.

Steps to Reproduce

Start a Claude Code session in a project directory
Open a second Claude Code session in the same project directory
The first session gets stuck processing
Press escape to stop processing
Type any command in the first session
The command is not acknowledged - session is completely unresponsive

Expected Behavior
Either:

Both sessions should remain active and responsive, OR
Clear documentation/warning about single-session limitation, OR
Graceful handling with a message explaining the session is inactive

Actual Behavior
The previous session silently becomes unresponsive with no indication of why commands are being ignored.

Environment Info

Platform: linux
Terminal: (using in remote environment)
Version: 2.0.45
OS: Linux 5.15.0-157-generic

Additional Context
This behavior was not present in earlier versions - users report this as new/changed behavior. There is no documented configuration to allow multiple active sessions or to control this behavior.

Errors

[]

This issue has been inactive for 30 days. If the issue is still occurring, please comment to let us know. Otherwise, this issue will be automatically closed in 30 days for housekeeping purposes.

Still occurring on the latest version.

Claude Code version: 2.1.33
OS: macOS (Darwin 25.2.0)
Architecture: arm64 (Apple Silicon)

ERROR  undefined is not an object (evaluating 'U.length')

 /$bunfs/root/claude:668:20555

 - O7 (/$bunfs/root/claude:668:20555)
 - RX (/$bunfs/root/claude:668:28704)
 - rO (/$bunfs/root/claude:668:28858)
 - M7 (/$bunfs/root/claude:668:25070)

Stack trace differs slightly from #20685 due to version/build difference, but same root cause (React hook dependency array becomes undefined).

Closing for now — inactive for too long. Please open a new issue if this is still relevant.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.

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[Bug] Previous session becomes unresponsive when opening new session in same project #13268

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[Bug] Previous session becomes unresponsive when opening new session in same project #13268

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github-actions commented on Jan 6, 2026

atani commented on Feb 6, 2026

github-actions commented on Mar 6, 2026

github-actions commented on Mar 13, 2026

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