›_ Claude Code Issues
Claude Code Issues / #26958

[Bug] Crash when selecting past session in code tab: Error 1YCZHOG

Resolved 💬 16 comments Opened Feb 19, 2026 by svef73 Closed Mar 20, 2026

Bug Description
cowork crashes when selecting a past session in code tab: error code 1YCZHOG

Environment Info

  • Platform: darwin
  • Terminal: Apple_Terminal
  • Version: 2.1.47
  • Feedback ID: 123a00d6-0c01-4e25-a2f5-70e2162e3849

Errors

[{"error":"AxiosError: Request failed with status code 401\n    at _x (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:34:1138)\n    at IncomingMessage.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:35:9827)\n    at IncomingMessage.emit (node:events:519:35)\n    at endReadableNT (node:internal/streams/readable:1701:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at Gv6.request (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:37:2132)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async o$6 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:104:3132)\n    at async p_A (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:104:8015)","timestamp":"2026-02-19T18:24:48.763Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:482:14)\n    at Socket.emit (node:events:507:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-02-19T18:25:00.726Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:482:14)\n    at Socket.emit (node:events:507:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-02-19T18:25:58.681Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:482:14)\n    at Socket.emit (node:events:507:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-02-19T18:26:08.900Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:482:14)\n    at Socket.emit (node:events:507:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-02-19T18:26:09.557Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:482:14)\n    at Socket.emit (node:events:507:28)\n    at addChunk (node:internal/streams/readable:559:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)\n    at Readable.push (node:internal/streams/readable:390:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-02-19T18:26:11.521Z"}]

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16 Comments

github-actions[bot] · 4 months ago

Found 3 possible duplicate issues:

  1. https://github.com/anthropics/claude-code/issues/26850
  2. https://github.com/anthropics/claude-code/issues/23338
  3. https://github.com/anthropics/claude-code/issues/26638

This issue will be automatically closed as a duplicate in 3 days.

  • If your issue is a duplicate, please close it and 👍 the existing issue instead
  • To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

chrisbutler · 4 months ago

also seeing this constantly

kiwimagic · 4 months ago

It's been like this since 10:15AM EST today. Quit Claude desktop, reopen, start working in code... may get 2 mins of work and BOOM back to this screen. Only effecting my desktop connection. Using VSCode Claude plugin has been fine during this time
<img width="745" height="583" alt="Image" src="https://github.com/user-attachments/assets/2342662e-d51c-4a0c-8431-49391ab9380b" />

PlipBusiness · 4 months ago

Getting error code 1YCZHOG any time I try and open certain sessions as well as getting them in new sessions after only a handful of messages requiring low token usage. This has been happening for 2 days now.

MoollaMore · 4 months ago

+1

icecacao0127 · 4 months ago

This has been happening for 2 days now.

jmurphee · 4 months ago
It's been like this since 10:15AM EST today. Quit Claude desktop, reopen, start working in code... may get 2 mins of work and BOOM back to this screen. Only effecting my desktop connection. Using VSCode Claude plugin has been fine during this time <img alt="Image" width="745" height="583" src="https://private-user-images.githubusercontent.com/10331428/552375345-2342662e-d51c-4a0c-8431-49391ab9380b.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.UUovW2HltgVh_e7txrKJHPDrrHrcerM8XiMLeZiqERs">

Same here. 24hrs and counting....

andrewpluu · 4 months ago

Same here. Incredibly frustrating and every time I type in another request I use up a ton of tokens. A full wipe and restart hasn't fixed a thing. New sessions, old sessions, if often crashes after the question, sometimes it gives me 3-4.

Using MacOS, programming in swift, using the desktop app.

InLceGg · 4 months ago

same for me.. please ;-((
windows11
since february 18

Orujimaru · 4 months ago

I am also experiencing this since february 18.
Windows 11,
Claude dektop app,
Claude Code.

AxxoMob · 4 months ago

Error Code - 1YCZHOG | Crashing since Feb 17, Windows 11

Desktop App - Chat | Cowork | Code - Code keeps crashing, both in previous and current sessions.

Tried everything Uninstalling, Reinstalling multiple times, clearing sessions, Hyper-V/Vmmem spawning on launch, 8 claude.exe processes, no crash logs being written, clearing session data didn't help.

Only Chat mode works smoothly, Cowork & Code crash instantaneously! AI Support are clueless! Human support - No reply!

!Image

Omri-Stein · 4 months ago

Reproducing this on macOS (latest desktop app). Crash logs at ~/Library/Logs/Claude/ show the chain clearly:

  1. setFocusedSession: sessionId=null fires when focusing on a chat session
  2. Immediately triggers React error #185 (infinite setState loop)
  3. Cascades into React error #418 (hydration mismatch on remount)
  4. Renderer dies → 1YCZHOG crash screen

Also seeing MaxListenersExceededWarning (11 $eipc_message$_$_AutoUpdater listeners) and preload script errors in the same timeframe.

Workaround that helps: Avoid clicking sessions in the sidebar list — instead, use the session search (Cmd+K or the search bar) to open sessions directly. This seems to bypass whatever triggers the sessionId=null focus event that kicks off the crash loop. It doesn't fix permanently corrupted sessions, but it reduces the frequency of new crashes significantly.

EkingIsrael · 4 months ago

I found the cause and solution to this issue!!!

  1. Add .claude/worktrees to your .gitignore file!
  2. Run `git rm -r --cached .claude/worktrees/

`

💪

Omri-Stein · 4 months ago

Found the root cause and fix!

The crash is caused by .claude/worktrees/ being tracked by git. The worktree metadata confuses the session renderer.

Fix:

  1. Add .claude/worktrees to your .gitignore
  2. Remove the cached worktree files:

``
git rm -r --cached .claude/worktrees/
``

  1. Restart the app

This resolved the 1YCZHOG crash completely for me.

github-actions[bot] · 3 months ago

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

github-actions[bot] · 3 months ago

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.