Building new project

Had this one on a new project, building it for the first time:

No steps yet to repro.

After setting the language, this error disappeared.

I find the related legacy code:

  cbbLanguage.Items.BeginUpdate;
  try
    for i := 0 to Languages.Count - 1 do
    begin
      localeID := Languages.LocaleID[i];
      cbbLanguage.AddItem(Languages.Name[i], TObject(localeID));
    end;
    cbbLanguage.ItemIndex := Languages.IndexOf(SysLocale.DefaultLCID);
  finally
    cbbLanguage.Items.EndUpdate;
  end;

The error should be raised when DefaultLCID is not in the languages.

    cbbLanguage.ItemIndex := Languages.IndexOf(SysLocale.DefaultLCID);

needs further investigation.