claude-code - 💡(How to fix) Fix [BUG] Claude Code 2.1.149 crashes on Windows x64 with Bun 1.3.14 Illegal instruction when running --resume

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?

Claude Code 2.1.149 crashes on Windows 11 x64 when I run claude --resume.

The crash happens inside the bundled Bun runtime:

panic(main thread): Illegal instruction at address 0x7FF66036EF90 oh no: Bun has crashed. This indicates a bug in Bun, not my code.

System details from the crash output:

• Bun v1.3.14 (521eedd6)
• Windows x64 baseline
• Windows v.win11_dt
• CPU features: sse42 avx avx2
• Args: "C:\Users\33029.local\bin\claude.exe" "--resume"

I rolled back to Claude Code 2.1.148 and the issue no longer occurs.

What Should Happen?

Running claude --resume should open the resume session picker or resume a previous Claude Code session normally.

It should not crash the bundled Bun runtime or terminate with an Illegal instruction panic.

Error Messages/Logs

Steps to Reproduce

1. Install or update Claude Code to version 2.1.149 on Windows 11 x64.

2. Open PowerShell.

3. Run:

   claude --resume

4. Claude Code crashes before the resume UI/session picker opens.

5. The crash output shows Bun v1.3.14 and:

   panic(main thread): Illegal instruction

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.148

Claude Code Version

2.1.149

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response