Why do i keep getting error (index a nil value) ?

• 20:48:13.471 - ServerScriptService.Main.RaceModule.FunctionScript.PlaceChecker NIL:21: attempt to index a nil value*

local RaceStatistics = game.Workspace.Game.RaceStatistics
local Positions = RaceStatistics.Positions

Bleh = false

RaceStatistics.Racing.Changed:connect(function(yus)
	
	if RaceStatistics.Racing.Value == true then
		if Bleh == false then
			
			Bleh = true
			
			repeat
				for i,k in pairs(game.Players:GetPlayers()) do
					if k.TrackStatistics.Racing.Value == true then 	
						if k.Character:findFirstChild("UpperTorso") then
					
							local magnitude = (k.Character.UpperTorso.Position - game.Workspace.Game.TimingSystem:findFirstChild("S"..k.TrackStatistics.Section.Value + 1).Position).magnitude
							
							Positions[k.Name].Value = magnitude
							
							local MyPos = 8
							
							for i,v in next, Positions:GetChildren() do
								if v.name ~= "NotUsed" then
								
									local temp = v.Name
									
									if game.Players[temp].TrackStatistics.Laps.Value < k.TrackStatistics.Laps.Value then
										MyPos = MyPos - 1
									elseif (game.Players[temp].TrackStatistics.Laps.Value == k.TrackStatistics.Laps.Value) and 
										(game.Players[temp].TrackStatistics.Section.Value < k.TrackStatistics.Section.Value) then 
										MyPos = MyPos - 1
									elseif (game.Players[temp].TrackStatistics.Laps.Value == k.TrackStatistics.Laps.Value) and 
										(game.Players[temp].TrackStatistics.Section.Value == k.TrackStatistics.Section.Value) and 
										(v.Value > Positions[k.Name].Value) then 
										MyPos = MyPos - 1
									end
								end
							end 
									
							k.TrackStatistics.Position.Value = MyPos
							
end
end
end

wait()

until RaceStatistics.Racing.Value == false 

Bleh = false

end
end
end)

Dont see why i would need to add the rest of the script