Follow Script does not work randomly.. Please help a guy out? :c

local	Zombie = script.Parent
local	zombieoid = Zombie.Zombie
local	spawnpos = Zombie.Torso.Position
local	configs = Zombie.Parent.Configurations

function jump(h)
local	player = h.Parent:FindFirstChild("Humanoid")
local	zombie = h.Parent:FindFirstChild("Zombie")
		if not player and not zombie and not h.Parent.ClassName == "Tool" and h.Name~="Bullet" then
			zombieoid.Jump = true
		end
end

Zombie.Torso.Touched:connect(function(hit)
	jump(hit)
end)

function GetClosest(directory,root)
local	tether,closest = configs.FollowDistance.Value ,nil
		for _,part in next,directory:GetChildren() do
			if workspace:FindFirstChild(part.Name) then
		local	dist = (part.Character.HumanoidRootPart.Position-root.Position).magnitude
				if dist < tether then
					closest = part
					tether = dist
				end
			end
		end
		return tether,closest
end

while wait(0) do
	if not Zombie:FindFirstChild("Head") then return end
local	dist,object = GetClosest(game.Players,Zombie.Head)
		if object then
	local	char = object.Character
			if char then
				if char.Humanoid.Health > 0 then
					zombieoid:MoveTo(char.HumanoidRootPart.Position)
					if dist < configs.DamageDistance.Value then
						char.Humanoid:TakeDamage(configs.Damage.Value)
					end
				else
					zombieoid:MoveTo(Zombie.Torso.Position)
				end
			end
		else
			zombieoid:MoveTo(Zombie.Torso.Position)
		end
end

Honestly if you think there is a better Follow script then that, share it as well. ;/ Wouldn't mind.

In your script you said if not player and not zombie. That means it won’t follow the player no matter what (this error is inside the function “jump”.