WalkSpeed scipt gone wrong?

idk what am I doing wrong, but anyways i want the script to change your walkspeed

script.Parent.ClickDetector.MouseClick:Connect(function(lol)
	local humanoid = lol.Parent:FindFirstChild("Humanoid")
	if humanoid ~= nil then
	humanoid.WalkSpeed = 0
	end
end)

To check if the player has a humanoid you need to use an if statement correctly like i have done below

script.Parent.ClickDetector.MouseClick:Connect(function(player)
    local Character = workspace:WaitForChild(player.Name)
    if Character:FindFirstChild('Humanoid') then
    Character.Humanoid.WalkSpeed = 0
    end
end)