Why is the script having a error?

I created a script, and testing it, and it gave a weird error I can't understand.

14:38:27.943 - ServerScriptService.Script:103: bad argument #2 to 'random' (interval is empty)

14:38:27.944 - Script 'ServerScriptService.Script', Line 103

14:38:27.945 - Stack End

Any solution?

Faulty code:

while true do
	contestants = {}
	blue = {}
	yellow = {}
	green = {}
	for _, player in pairs(game.Players:GetPlayers()) do
		if player and player.Character then
			local humanoid = player.Character:WaitForChild("Humanoid")
			if humanoid and humanoid.Health > 0 and player.TeamColor.Name == "Lime green" then
				table.insert(contestants, player)
				table.insert(green, player)
			elseif humanoid and humanoid.Health > 0 and player.TeamColor.Name == "New Yeller" then
				table.insert(contestants, player)
				table.insert(yellow, player)
			elseif humanoid and humanoid.Health > 0 and player.TeamColor.Name == "Really blue" then
				table.insert(contestants, player)
				table.insert(blue, player)
			end
		end
	end
	local bluerep = blue[math.random(1, #blue)]
	local yellowrep = yellow[math.random(1, #yellow)]
	local greenrep = green[math.random(1, #green)]
	bluerep:MoveTo(game.Workspace.R62_Trk1.Model.VehicleSeat.Position)
	yellowrep:MoveTo(game.Workspace.R62_Trk3.Model.VehicleSeat.Position)
	greenrep:MoveTo(game.Workspace.R62_Trk4.Model.VehicleSeat.Position)
end