Value cannot be null. (Parameter 'row')

at Denno.Race.GetRaceData(List`1 individualDriverHtmlDocs) in D:\Data\Git\Denno\Denno\src\Race.cs:line 226 at Denno.Race..ctor(Int32 raceId) in D:\Data\Git\Denno\Denno\src\Race.cs:line 91 at Denno.Pages.LapCharts.LapChartModel.OnGet(Int32 raceId) in D:\Data\Git\Denno\Denno\Pages\LapCharts\LapChart.cshtml.cs:line 28