Bot stopps when TimeTillClose()

Hello,

my bot stopps sometimes when backtesting. I could figure out that it has something to do with TimeTillClose().

Symbol: USPJPY, m1

Error: "Crashed in OnTick with InvalidOperationException: Die Sequenz enthält keine Elemente." - "Bot was stopped"

Some Stopping Dates: 11 Feb 2011, 29 Apr 2011, 14 Nov 2014, 16 Mar 2018 (always a Friday)

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.EasternStandardTime, AccessRights = AccessRights.None)]
    public class NewcBot : Robot
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }

        protected override void OnStart()
        {
            // Put your initialization logic here
        }

        protected override void OnTick()
        {
            // Put your core logic here
            var list = Symbol.MarketHours.Sessions;

            if (Time.TimeOfDay == TimeSpan.FromMinutes(1019))
            {
                TimeSpan tim = new TimeSpan();
                tim = Symbol.MarketHours.TimeTillClose();
            }
        }

        protected override void OnStop()
        {
            // Put your deinitialization logic here
        }
    }
}