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[Bug] Windows app still crashes (0xc0000409, ntdll) when clicking the attach/paperclip button — persists in v2026.9.8-1

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
54/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
csharp
Domain
desktop

Research direction

Start by locating the Chat page handler logged as OnAttachClicked and tracing how it opens the native file picker; the issue does not name the source file or test. Reproduce on Windows by clicking the attach button while connected to a gateway, then check whether the picker opens and the selected file is staged without the app exiting. The reporter offers crash dumps or a WER report if needed.

Written by the indexing model from the issue text.

Description

clawsweeper:needs-maintainer-review clawsweeper:no-new-fix-pr impact:crash-loop issue-rating: 🦪 silver shellfish P1
Summary

Clicking the paperclip (attach) button in the chat composer makes the Windows app exit immediately (fail-fast: no error dialog, no managed exception). Still reproducible after upgrading to v2026.9.8-1 (previously reproduced on 2026.9.4.0).

Environment
  • App: OpenClaw Tray / Windows Companion (WinUI) — OpenClaw.Tray.WinUI.exe
  • App version: v2026.9.8-1 (installed via OpenClawCompanion-Setup-x64.exe, release tag v2026.9.8-1)
    • Also reproduced on 2026.9.4.0 (product 2026.9.4+3c43751b)
  • OS: Windows 11 (faulting module ntdll.dll 10.0.26100.9549)
  • Gateway: OpenClaw 2026.9.6 (protocol 4), remote gateway
Steps to reproduce
  1. Open the app's Chat page, connected to a gateway.
  2. Click the paperclip / attach button in the composer.
  3. The whole app exits instantly — no dialog appears.

Reproduced 3/3 times on 2026-09-26 (20:12:35, 20:13:22, 20:30:17 local) and again after updating to v2026.9.8-1 on 2026-10-08.

Expected

The native file picker opens and the selected file is staged in the composer.

Actual

The process dies immediately.

Evidence
  • openclaw-tray.log: the last line before each crash is
    [INFO] [ChatPage] OnAttachClicked invoked
    and the next launch logs [ERROR] Previous session did not exit cleanly.
  • Windows Application Error event (identical each time):
    faulting module ntdll.dll, exception code 0xc0000409 (fail-fast), faulting offset 0x124406.
  • Crash dumps present: %LOCALAPPDATA%\CrashDumps\OpenClaw.Tray.WinUI.exe..dmp
  • No managed exception is written to the crash log for these crashes → native fail-fast, consistent with opening the file picker without a valid window handle.
Workaround

Pasting (Ctrl+V) or dragging the same file into the window works, and the gateway accepts the attachment — only the paperclip path crashes.

Notes
  • Searched the tracker: no existing issue for this crash (keyword OnAttachClicked → 0 hits). Closest are #1621 / #1644 (attachment handling), which are not crashes.
  • Happy to provide a crash dump / WER report if useful.
Dominant language
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Merged PRs (30d)
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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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