says line 17 is indexing a nil value?

local viewPort = script.Parent:WaitForChild("ViewportFrame")
local playerAro = script.Parent.ViewportFrame.Player


local WildLife = workspace:WaitForChild("WildLife")
--WildLife:Clone().Parent = viewPort
local cild = game.Workspace:GetChildren()
local player = game.Players.LocalPlayer
player.CharacterAdded:Wait()

for index = 1, #cild do
	if cild[index].Name ~= "Camera" then
		if cild[index].Name ~= "Terrain" then
			if cild[index].Name ~= nil then
				if cild[index].Parent ~= nil then
					print(cild[index].Name)
					cild[index]:Clone().Parent = viewPort
				end
			end
		end
	end
end

local camera = Instance.new("Camera",workspace)
camera.CameraType = Enum.CameraType.Scriptable

local height = 50

viewPort.CurrentCamera = camera

game:GetService("RunService").RenderStepped:Connect(function()
	local pos = player.Character.HumanoidRootPart.Position
	camera.CFrame = CFrame.new(Vector3.new(pos.X,height,pos.Z),pos)
	playerAro.CFrame = player.Character.HumanoidRootPart.CFrame
end)