Error when opening the calendar: ArgumentOutOfRangeException

Hello

I get this error every time when opening the calendar, everything else is fine. Any ideas how to solve this error? Many thanks, Artur

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eM Client (7.1.29274.0)
Windows: Microsoft Windows NT 10.0.14393.0, Framework: 4.0.30319.42000
The following error has occurred:
System.ArgumentOutOfRangeException: The added or subtracted value results in an un-representable DateTime.
Parameter name: t
   at System.DateTime.op_Addition(DateTime d, TimeSpan t)
   at MailClient.UI.Controls.Calendar.WeekCalendarView.GetDateTime(Int32 x, Int32 y, Boolean includeMultiDayArea, SnapToGridMode mode, Boolean checkBoundaries, DateTime& ret)
   at MailClient.UI.Controls.Calendar.WeekCalendarView.GetGraphicalEventEndLocal(IEvent ev, DateTime day)
   at MailClient.UI.Controls.Calendar.WeekCalendarView.SetEventRelativePositions()
   at MailClient.UI.Controls.Calendar.WeekCalendarView.RefreshEvents()
   at MailClient.UI.Controls.Calendar.WeekCalendarView.Resize(Object sender, EventArgs e)
   at MailClient.UI.Controls.controlCalendar.controlCalendar_Resize(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnResize(EventArgs e)
   at System.Windows.Forms.UserControl.OnResize(EventArgs e)
   at System.Windows.Forms.Control.OnSizeChanged(EventArgs e)
   at System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32 width, Int32 height, Int32 clientWidth, Int32 clientHeight)
   at System.Windows.Forms.Control.UpdateBounds()
   at System.Windows.Forms.Control.WmWindowPosChanged(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.UserControl.WndProc(Message& m)
   at MailClient.UI.Controls.controlCalendar.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)