attempted to index nil with 'Instance' error when trying to raycast?

so i made like kind of mechanics in ninja legends 2 when you hit the ground after jumping it made like a crack but it just comes with the error attempted to index nil with 'Instance' Local Script :

local uis = game:GetService("UserInputService")

uis.InputBegan:Connect(function(k,p)
	if p then return end
	if k.KeyCode == Enum.KeyCode.Space then
		wait(0.2)
		local raycastparams = RaycastParams.new()
		raycastparams.FilterDescendantsInstances = {game.Players.LocalPlayer.Character}
		raycastparams.FilterType = Enum.RaycastFilterType.Blacklist
		local ray = workspace:Raycast(game.Players.LocalPlayer.Character.HumanoidRootPart.Position,game.Players.LocalPlayer.Character.HumanoidRootPart.CFrame.UpVector*-7,raycastparams)
		local part = Instance.new("Part")
    if ray.Instance ~= nil then
		part.Parent = workspace
		part.Anchored = true
			part.CFrame = CFrame.new(ray.Position,ray.Position + ray.Normal)
		end
	end
end)