[BUG] When adding a prompt to a session that ended up as a Merged PR, the Agent produced a blank never-ending response.

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?

[BUG] When adding a prompt to a session that ended up as a Merged PR, the Agent produced a blank never-ending response.

Title: Session hangs with blank never-ending response after PR merge and branch deletion

Description:

After merging a PR and deleting its branch, attempting to add a new prompt to the session results in a blank response that never completes. The loading animation (ellipsis) in the left column continues indefinitely.

Environment:

• Claude Code: 1.7196.0 (2dbd78) built 2026-05-12T05:34:40.000Z
• macOS: 26.3.1 (a) (25D771280a)

Actual Behavior:

• Agent produces a blank response
• Loading animation (ellipsis) appears in the left sidebar and never stops
• Response never completes
• Issue persists even after restarting the session

What Should Happen?

Expected Behavior:

• Agent should process the new prompt normally
• A response should be generated and displayed

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce:

1. Create a Claude Code session and work on a feature
2. Submit the work as a pull request
3. Have the PR reviewed (e.g., via Copilot)
4. Merge the PR and delete the branch
5. Return to the Claude Code session
6. Type a new prompt in the input field and press Enter

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.7196.0 (2dbd78) built 2026-05-12T05:34:40.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1375" height="1082" alt="Image" src="https://github.com/user-attachments/assets/2714047a-0f08-4f0f-bcf3-2906e150ffff" />