My game broke due to a roblox update and i'm really sad, any help?

while wait(.1) do
	local children = game.Players:GetChildren()
	for i = 1, #children do
		if children[i].Character ~= nil then
		local hum = children[i].Character.Humanoid
		hum.WalkSpeed = children[i].leaderstats.Points.Value/75 + 1
		end
	end
end

Roblox says on line 4 there is and error in the console when playing the game, someone please fix this its broken

I reverted it to an old update and it works again!