Attempt to index a nil value fix?

I found a vampire script and I'm attempting to modify it, but when i go to try and make it remove the players shirt, It works, but the rest of the script doesnt execute due to the error. Workspace.Player.vmp.Vampire:13: attempt to index a nil value

if script.Parent.Name == "vmp" then
	wait(5)
	e = script.Parent.Parent:children()
	for i = 1,#e do
		if e[i]:IsA("Part") then
			wait(1)
			e[i].BrickColor = BrickColor.new("White")
			e[i].Parent:FindFirstChild("Head"):FindFirstChild("face").Texture="http://www.roblox.com/asset/?id=7323991"
			e[i].Parent:FindFirstChild("Torso").BrickColor = BrickColor.new("Black")
			e[i].Parent:FindFirstChild("Right Leg").BrickColor = BrickColor.new("Black")
			e[i].Parent:FindFirstChild("Left Leg").BrickColor = BrickColor.new("Black")
			e[i].Parent:FindFirstChild("Torso"):FindFirstChild("roblox").Texture=""
			e[i].Parent:FindFirstChild("Shirt"):remove()
		end
	end
	script.Parent = script.Parent.Parent
end

local larm = script.Parent:FindFirstChild("Left Arm")
local rarm = script.Parent:FindFirstChild("Right Arm")

target = nil

function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 1000
	local temp = nil
	local human = nil
	local temp2 = nil
	for x = 1, #list do
		temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent) and (temp2:findFirstChild("vmp") == nil) then
			followed = false
			z = Workspace:children()
			for x = 1,#z do
				if z[x]:findFirstChild("vmp") and z[x] ~= script.Parent then
					if z[x].vmp.Value == temp2 then
						followed = true
					end
				end
			end
			if not followed then
				temp = temp2:findFirstChild("Torso")
				human = temp2:findFirstChild("Humanoid")
				if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
					if (temp.Position - pos).magnitude < dist then
						torso = temp
						dist = (temp.Position - pos).magnitude
					end
				end
			end
		end
	end
	return torso
end

function onTouched(part)
	if debounce then return end
	debounce = true
	print("Touched", part.Parent:findFirstChild("Torso"),target)
	if part.Parent:findFirstChild("Torso") then
		if part.Parent.Torso == target then
			script.Parent.Animate.Disabled = true
			part.Parent.Humanoid.PlatformStand = true
			g = Instance.new("BodyGyro")
			g.Parent = part.Parent.Torso
			g.cframe = CFrame.new(Vector3.new(0,0,0), Vector3.new(0,-5000000,0))
			g.maxTorque = Vector3.new(math.huge,math.huge,math.huge)
			g.Name = "bg"
			w = Instance.new("Weld")
			w.Parent = script.Parent.Head
			w.Part0 = part.Parent.Head
			w.Part1 = w.Parent
			w.C0 = CFrame.new(0,.5,1) * CFrame.fromEulerAnglesXYZ(0,0,-2)
			script.Parent.Torso["Left Shoulder"].DesiredAngle = -3
			script.Parent.Torso["Right Shoulder"].DesiredAngle = 3
			script.Parent.Torso["Left Hip"].DesiredAngle = -.5
			script.Parent.Torso["Right Hip"].DesiredAngle = .5
			wait(4)
			if script.Parent.Humanoid.Health ~= 0 then
				b = Instance.new("ObjectValue")
				b.Parent = part.Parent
				b.Name = "vmp"
				script:clone().Parent = b
			end
			g:Remove()
			w:Remove()
			script.Parent.Animate.Disabled = false
			part.Parent.Humanoid.PlatformStand = false
			wait(.5)
		end
	end
	debounce = false
end

			
if script.Parent:findFirstChild("Head2") == nil then
	character = script.Parent
	a = character.Head:clone()
	character.Head.Transparency = 1
	a.Parent = character
	a.Name = "Head2"
	b = Instance.new("Weld")
	b.Parent = a
	b.Part0 = character.Head
	b.Part1 = a
end

script.Parent.Torso.Touched:connect(onTouched)

while true do
	wait(.1)
	target = findNearestTorso(script.Parent.Torso.Position)
	if target ~= nil and not attacking then
		script.Parent.vmp.Value = target.Parent
		mag = (script.Parent.Torso.Position - target.Position).magnitude
		script.Parent.Humanoid:MoveTo(target.Position+script.Parent.Torso.CFrame.lookVector*2, target)
		e = script.Parent:children()
		for i = 1,#e do
			if e[i]:IsA("BasePart") and e[i].Name ~= "Head" then
				e[i].Transparency = 0 + (mag/50)
			end
			if e[i]:IsA("Hat") then
				e[i].Handle.Transparency = 0 + (mag/50)
			end
		end
	else
		script.Parent.Humanoid:MoveTo(script.Parent.Torso.Position, script.Parent.Torso)
	end
end

If i messed up let me know im new to this forum. Please help me fix line 13

Instead, add an IF statement to check if it exists.

if e[i].Parent:FindFirstChild("Shirt") then
e[i].Parent:FindFirstChild("Shirt"):Destroy() -- :remove() is deprecated.
-- Consider this: In local scripts, use remove(), but we are using normal script.
end

Hope this helps! Thanks, marcoantoniosantos3.