Invalid torso (doesn't get the Vector3 value)?

So I've been working on my game and I've got a script that shows a GUI when I come in 10 studs radius of the NPC or as I named it: "Dummy". The Dummies are located in a special folder called "Dummys" in the workspace. I have been recently working on the "Magnitude" function. I am fairly new to scripting and I am still learning. For the scripts, I want to do I normally get stuck on them for hours upon hours, and I have to watch a lot of videos in order to fix certain sections of the scripts. The local script's location is in a Gui and that Gui is located in StarterGui.

The error message says:

Players.Himillumine.PlayerGui.Every.Checker:16: bad argument #1 to '?' (Vector3 expected, got nil)

This is the script:

	
	local Players = game:GetService("Players")
	local player = Players.LocalPlayer
	local myTorso = player.Character:GetChildren("Torso")
 	local myHumanoid = player.Character:FindFirstChild("Humanoid")
 

	function findTarget()
		local dist = Vector3.new(10, 10, 10)
		local target = nil
		for i,v in pairs(game.Workspace.Dummys:GetChildren()) do
			if v.Name == "Dummy" then
			local human = v:FindFirstChild("Humanoid")
			local torso = v:FindFirstChild("Torso")
			if human and torso then
				if human.Health > 0 then
						if (myTorso.Position - torso.Position).Magnitude < dist then
							dist = (myTorso.Position - torso.Position).Magnitude
							target = torso
							print("Works!")
						end
					end
				end
			end
		end
		return target
	end
	
	while wait(1) do
		local torso = findTarget()
		if torso then
			script.Parent.Enabled = true
			print("YES!")
		else
			print("NOO!")
		end
	end