Why does this keep returning nil?

local deb = false

script.Parent.Touched:connect(function(h)
	if h.Parent:FindFirstChild("Humanoid") then
		if deb == true then return end
		deb = true
script.Parent.Sound4:Play()
		local player = game.Players:GetPlayerFromCharacter(h.Parent)
		if player.Character:FindFirstChild("Left Leg") or player.Character:FindFirstChild("Right Leg") then
			if player.Character:FindFirstChild("Left Leg") then
			player.Character["Left Leg"]:Destroy()
				end
			if player.Character:FindFirstChild("Right Leg") then
			player.Character["Right Leg"]:Destroy()
			end
			end
			elseif player.Character:FindFirstChild("Left Leg") ~= nil and player.Character:FindFirstChild("Right Leg") ~= nil then
			if player.Character:FindFirstChild("Torso") then
			player.Character.Torso:Destroy()
			end
	end
	deb = false
	end)

Touching this brick is supposed to destroy the player's legs. If they touch it again while they don't have any legs, their torso will be destroyed. The part where the legs get destroyed works fine, however for some reason I get an "attempt to index field 'Parent' (a nil value)" when I touch it again.

local ready = true --starting with a debounce var as true simplifies the debounce if statement. I called it 'ready' to increase human readability. ('if condition and ready' reads much better)

script.Parent.Touched:connect(function(h)
	if h.Parent:FindFirstChild("Humanoid") and ready then --verify humanoid and debounce
		ready = false --switch debounce
		script.Parent.Sound4:Play()
		--you didn't really need this line, at least for what you included in ScriptingHelpers
		if h:FindFirstChild("Left Leg") or h:FindFirstChild("Right Leg") then --h is still the character, so you don't have to go through the player.
			if h:FindFirstChild("Left Leg") then --this will always destroy the left leg first. You can switch this if you want the right leg destroyed first.
				h["Left Leg"]:Destroy()
			else
				h["Right Leg"]:Destroy()
			end
		elseif h:FindFirstChild("Torso") then
			h["Torso"]:Destroy() --you used (paraphrased) h.Torso:Destroy(). That's likely your problem
		end
		ready = true
	end
end)

Its not h use hit

view source

local deb = false

script.Parent.Touched:connect(function(hit)

if hit.Parent:FindFirstChild("Humanoid") then

    if deb == true then return end

    deb = true

script.Parent.Sound4:Play()

    local player = game.Players:GetPlayerFromCharacter(hit.Parent)<---only use this for GUIS Touch to make a gui pop up

Use this

player = hit.Parent if player:FindFirstChild("Left Leg") or player:FindFirstChild("Right Leg") then

        if player:FindFirstChild("Left Leg") then

        player["Left Leg"]:Destroy()

            end

        if player:FindFirstChild("Right Leg") then

        player[Right Leg"]:Destroy()

        end

        end

        elseif player:FindFirstChild("Left Leg") ~= nil and player:FindFirstChild("Right Leg") ~= nil then

        if player:FindFirstChild("Torso") then

        player.Torso:Destroy()

        end

end

deb = false

end)

--hit.Parent means Character that touch the part that is in the workspace