Indicator does not start at midnight

I have this indicator code that should draw vertical lines every 90 min starting at 00:00, but it starts at 00:30. What do I need to add/modify that the first line each day starts at 00:00?

using System;using cAlgo.API;using cAlgo.API.Indicators;using cAlgo.API.Internals;using cAlgo.Indicators;namespace cAlgo{    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]    public class VerticalLinesEvery90Minutes : Indicator    {        [Parameter("Lookback Period (Days)", DefaultValue = 5)]        public int LookbackPeriodInDays { get; set; }        protected override void Initialize()        {   Color _color = Color.FromArgb (75, Color.Gray);            DateTime currentTime = Bars.OpenTimes.LastValue;                                for (int i = 0; i <= LookbackPeriodInDays; i++)            {                DateTime currentDate = currentTime.Date.AddDays(-i);                DateTime lineTime = currentDate.AddHours(0).AddMinutes(0);                while (lineTime < currentDate.AddHours(24))                {                    int minutesSinceMidnight = (int)(lineTime - currentDate).TotalMinutes;                    if (minutesSinceMidnight % 90 == 0)                    {                        Chart.DrawVerticalLine("VerticalLine" + lineTime.ToString("yyyyMMddHHmm"), lineTime, _color, 1, LineStyle.Solid);                    }                    lineTime = lineTime.AddMinutes(90); // Increment by 90 minutes                }            }        }        public override void Calculate(int index)        {            // Calculate method not needed for this indicator        }    }}