Why is is saying attempt to index nil with Touched?

Here is my code

local model = workspace.Plots["1"].Building

model.ChildAdded:Connect(function()
	for name, child in pairs(model:GetChildren()) do
		child:FindFirstChild("Hitbox").Touched:Connect(function(hit)
			if hit.Parent ~= child then
				child:Destroy()
			end
		end)
	end
end)

The child is a model and it has a part under it called Hitbox but in the console it is saying attempt to index nil with Touched

inside ChildAdded, pass the child that gets created and make sure it is the hitbox and then use the touched event

ChildAdded:Connect(function(child)
--code
end)