0.39.8beta1使ってたらエラー落ちした
直前にしたのはジェスチャを使って「未読スレッドを全部開く」
更新した直後は同じ操作をしても問題なかったんだが時間が経ってからしたら落ちた

> [Window Title]
> Fatal Error on Render window.
>
> [Main Instruction]
> Minified React error #185; visit https://react.dev/errors/185 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
>
> [Content]
> Error: Minified React error #185; visit https://react.dev/errors/185 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
> at Dr (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:367299)
> at Rr (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:366872)
> at wi (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:392367)
> at file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:392245
> at Object.m [as onStateChange] (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:585990)
> at Object.i [as callback] (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:580873)
> at file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:581041
> at Object.notify (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:581062)
> at Object.notifyNestedSubs (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:581517)
> at i (file:///x:/xxx/Siki-win32-x64/resources/app.asar/assets/render.js:2:580873)