Getting error "System.FormatException" when trying to commit a file using Toad with svn (73491)

Getting error "System.FormatException" when trying to commit a file using Toad with svn.
Complete error message:

System.FormatException
De indeling van de invoertekenreeks is onjuist.
Stack Trace:
bij System.Text.StringBuilder.FormatError()
bij System.Text.StringBuilder.AppendFormat(IFormatProvider provider, String format, Object[] args)
bij System.String.Format(IFormatProvider provider, String format, Object[] args)
bij Quest.Toad.Util.Global.DisplayMessage(String caption, String message, Object[] par)
bij Quest.Toad.Util.Global.DisplayMessage(String caption, Exception exception)
bij Quest.Toad.Settings.SettingForm.SaveSettings()
bij Quest.Toad.Settings.SettingForm.btnOk_Click(Object sender, EventArgs e)
bij System.Windows.Forms.Control.OnClick(EventArgs e)
bij DevExpress.XtraEditors.BaseButton.OnClick(EventArgs e)
bij DevExpress.XtraEditors.BaseButton.OnMouseUp(MouseEventArgs e)
bij System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
bij System.Windows.Forms.Control.WndProc(Message& m)
bij DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
bij System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
bij System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
bij System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

The problem is that the svn program does not allow commits with empty log-messages.
When trying to commit the Toad files manually without commit message, they receive the output below:

RESOLUTION

Enhancement request ST84690 has been submitted to Development for consideration in a future release of Toad for DB2.
Toad will display the correct error message instead of throwing a System error.

WORKAROUND

Enter a message when committing files in toad or disable the "empty-commit-message"-check in svn.
,