How do I fix Humanoid is not a valid member of "Model"?

Hi, I'm trying to make walking npcs fight enemy npcs, this was successful however there's a bug where if the enemy is already dead by the time the ally npc detects the enemy, it will freeze and be unable to do anything. How can I fix this?

I tried adding so it would detect if the humanoid WAS nil beforehand however I still encounter this problem.

local Enemies = workspace.Enemies
local Humanoid = script.Parent:WaitForChild("Humanoid")
local Self = script.Parent
local AttackEffect = script.Parent.HumanoidRootPart.ParticleEmitter

local target = nil

function FindTarget()
	local maxdistance = 100
	local nearesttarget = nil
	
	for i, target in ipairs(Enemies:GetChildren()) do
		local distance = (target.HumanoidRootPart.Position - Self.HumanoidRootPart.Position).Magnitude
		--print(target.Name, distance)
		if distance < maxdistance then
			print(target.Name, "shall be initiated!")
			nearesttarget = target
		end
		
		return nearesttarget
	end
end


while true do
	local target = FindTarget()
	if target and target.Humanoid ~= nil then
		Humanoid:MoveTo(target.HumanoidRootPart.Position)
		Humanoid.MoveToFinished:Wait()
		if target.Humanoid == nil then return end
			if target.Humanoid.Health > 0 then
				target.Humanoid:TakeDamage(1)
				AttackEffect.Enabled = true
				print(target.Humanoid.Health)
			end
	end
	task.wait(.2)
	AttackEffect.Enabled = false
	end

The way it works is that it detects an enemy within it's range then pursue the enemy and damage them.