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claude-code - 💡(How to fix) Fix [BUG] Bun v1.3.14 (0a466a11) Windows x64 (baseline) [1 comments, 2 participants]

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anthropics/claude-code#56205•Fetched 2026-05-06 06:34:22
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wilurnwilurn
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francobitt-EIfrancobitt-EIwilurnwilurn
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Error Message

Error Messages/Logs

error

Code Example

PS C:\WINDOWS\system32> claude
============================================================
Bun v1.3.14 (0a466a11) Windows x64 (baseline)
Windows v.win11_dt
CPU: sse42 avx avx2
Args: "C:\Users\wiroonp\AppData\Roaming\npm\node_modules\@anthropic-ai\claude-code\bin\claude.exe"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) fetch jsc spawn(2) standalone_executable yaml_parse claude_code
Builtins: "bun:ffi" "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:crypto" "node:dns" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:path/posix" "node:path/win32" "node:perf_hooks" "node:process" "node:readline" "node:stream" "node:stream/consumers" "node:string_decoder" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "node:vm" "node:zlib" "ws" "node:http2"
Elapsed: 530ms | User: 343ms | Sys: 156ms
RSS: 0.37GB | Peak: 0.37GB | Commit: 0.42GB | Faults: 91527 | Machine: 16.85GB

panic(main thread): Segmentation fault at address 0x40FE0

panic: Segmentation fault at address 0x2BEA244FFE8
panicked during a panic. Aborting.
PS C:\WINDOWS\system32>
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?

Bun v1.3.14 (0a466a11) Windows x64 (baseline) CPU: sse42 avx avx2 panic: Segmentation fault at address 0x40FE0

What Should Happen?

Bun v1.3.14 (0a466a11) Windows x64 (baseline) CPU: sse42 avx avx2 panic: Segmentation fault at address 0x40FE0

Error Messages/Logs

PS C:\WINDOWS\system32> claude
============================================================
Bun v1.3.14 (0a466a11) Windows x64 (baseline)
Windows v.win11_dt
CPU: sse42 avx avx2
Args: "C:\Users\wiroonp\AppData\Roaming\npm\node_modules\@anthropic-ai\claude-code\bin\claude.exe"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) fetch jsc spawn(2) standalone_executable yaml_parse claude_code
Builtins: "bun:ffi" "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:crypto" "node:dns" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:path/posix" "node:path/win32" "node:perf_hooks" "node:process" "node:readline" "node:stream" "node:stream/consumers" "node:string_decoder" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "node:vm" "node:zlib" "ws" "node:http2"
Elapsed: 530ms | User: 343ms | Sys: 156ms
RSS: 0.37GB | Peak: 0.37GB | Commit: 0.42GB | Faults: 91527 | Machine: 16.85GB

panic(main thread): Segmentation fault at address 0x40FE0

panic: Segmentation fault at address 0x2BEA244FFE8
panicked during a panic. Aborting.
PS C:\WINDOWS\system32>

Steps to Reproduce

error

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

claude --version 2.1.128 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The segmentation fault error in Claude Code v2.1.128 on Windows may be related to a regression introduced in a recent version, and downgrading to a previous version or waiting for a patch might be necessary.

Guidance

  • The error message "panic: Segmentation fault at address 0x40FE0" suggests a memory access issue, which could be caused by a bug in the Claude Code or its dependencies.
  • Since this is reported as a regression, comparing the changes between the last working version and the current version might help identify the root cause.
  • The fact that it worked in a previous version implies that the issue might be specific to the current version of Claude Code or its interaction with the Windows environment.
  • Gathering more information about the last working version and the changes made since then could be crucial in resolving this issue.

Notes

The lack of information about the last working version and the steps to reproduce the error limits the ability to provide a more specific solution.

Recommendation

Apply workaround: Since the issue is reported as a regression and the last working version is not specified, waiting for a patch or seeking assistance from the developers might be the best course of action.

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