Edit Comment comment fails with dreaded "Object reference not set to an instance of an object." error

After editing an existing comment this error comes up after clicking [OK] in the Edit Comment dialog. The changes to the comment aren't saved. They are still there though while the "Edit Target Comments" dialog is open (i.e. I can click on [Edit] and see my changes in the Edit Comment dialog).

<SDLErrorDetails time="19.01.2022 20:10:16">
  <ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
  <Exception>
    <Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>Sdl.TranslationStudio.Editor</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   at Sdl.TranslationStudio.Editor.Comments.EditCommentsDlg.buttonUpdate_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>Trados Studio</ProductName>
    <ProductVersion>Studio16</ProductVersion>
    <EntryAssemblyFileVersion>16.2.9.9198</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Home</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>16670208 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

This happens since the upgrade to Studio 2021 and it concerns target comments added by myself. I haven't tried this with other comments.

My current workaround is

  1. copy the comment's text to the clipboard
  2. delete the comment
  3. create a new comment, paste in the text, edit it and save ([OK])

Of course, it is cumbersome and I would appreciate if this would work again as it should.

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