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claude-code - 💡(How to fix) Fix [BUG] "1.3036.0 — cowork session crashes with exit code 1 on macOS 26.4.1" [3 comments, 4 participants]

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anthropics/claude-code#49524•Fetched 2026-04-17 08:38:40
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navarrenavarre
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claude[bot]claude[bot]github-actions[bot]github-actions[bot]navarrenavarrestohnstohn
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After updating to Claude 1.3036.0 (cf521c, built 2026-04-16T16:17:33Z), the Claude Code desktop app crashes immediately with "Claude Code process exited with code 1" in every code-mode session on a previously working project. No session was able to start successfully after the update.

Error Message

  1. Any action — new prompt, resume conversation, navigate files — produces the error banner:

Error Messages/Logs

Click on the Cowork tab. Open a new task, or click on an existing one. The error message comes up right away. Even if I just type 'ping'

Root Cause

After updating to Claude 1.3036.0 (cf521c, built 2026-04-16T16:17:33Z), the Claude Code desktop app crashes immediately with "Claude Code process exited with code 1" in every code-mode session on a previously working project. No session was able to start successfully after the update.

RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Summary

After updating to Claude 1.3036.0 (cf521c, built 2026-04-16T16:17:33Z), the Claude Code desktop app crashes immediately with "Claude Code process exited with code 1" in every code-mode session on a previously working project. No session was able to start successfully after the update.

Environment

  • Claude version: 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z
  • macOS: 26.4.1 Tahoe (Build 25E253)
  • Hardware: MacBook Pro, Apple Silicon
  • Previous state: Claude Code was working normally before this update. The session had been long-running (multiple days), active on a large project (~1,500 commits, ~1.5 GB repo, heavy PDF/image extraction pipelines, custom MCP usage).

Repro

  1. Install Claude Code update 1.3036.0 (automatic, delivered 2026-04-16).
  2. Open existing project in code mode.
  3. Any action — new prompt, resume conversation, navigate files — produces the error banner:

    ⚠ Something went wrong Claude Code process exited with code 1 You can restart the conversation from an earlier message.

What I tried (none fixed it)

  • grep -i anthropic ~/.zshrc ~/.zprofile ~/.bash_profile — no ANTHROPIC_API_KEY set anywhere
  • echo $ANTHROPIC_API_KEY — empty
  • Moved ~/Library/Application Support/Claude/claude-code-sessions/ out of the way (session cleanup)
  • Full quit (Cmd+Q) and restart of Claude Code
  • Confirmed no managed-mcp.json present

Notes

  • This matches the pattern of #8557 ("VS Code extension — process exited with code 1 since update") and #36419 ("code mode crashes instantly, VM never boots").
  • The crash started immediately after the 1.3036.0 update. Prior build (whatever shipped before today) worked fine on the same project with identical environment.
  • Screenshot attached below.

Screenshot

[drag and drop your screenshot here — GitHub will insert it automatically]

What Should Happen?

After clicking retry, it should just work

Error Messages/Logs

Steps to Reproduce

Click on the Cowork tab. Open a new task, or click on an existing one. The error message comes up right away. Even if I just type 'ping'

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1161" height="790" alt="Image" src="https://github.com/user-attachments/assets/166351d5-c111-40a7-afec-89fe5e96a37d" />

extent analysis

TL;DR

The issue is likely related to the recent update of Claude Code to version 1.3036.0, and a potential workaround could be to revert to a previous version or wait for a patch.

Guidance

  • The error "Claude Code process exited with code 1" suggests a critical failure in the application, potentially related to the update.
  • Given the similarity to issues #8557 and #36419, it's possible that the problem is related to the update and not specific to the user's environment or project.
  • Try checking the Claude Code release notes or GitHub issues for any known problems or fixes related to version 1.3036.0.
  • If possible, attempt to reproduce the issue with a smaller project or a different code mode to isolate the problem.

Notes

The lack of error messages or logs in the provided output makes it difficult to pinpoint the exact cause of the issue. The provided screenshot may contain useful information, but it's not accessible in this format.

Recommendation

Apply workaround: Given the regression nature of the issue and the immediate onset after the update, it's likely that the problem is related to the new version. If a previous version was working, reverting to that version might be a temporary solution until a patch is released.

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