Humanoid Is Not A Valid Member Of Workspace?

So I have this script inside my sword, and it seems to throw up an error when it touches anything other than a player, and I can't seem to find a way to make it still do damage to a humanoid if it touches something that doesn't contain a Humanoid

I've tried WaitForChild, but it throws up an infinite yield error

Av = 15 --Attack Value

tool = script.Parent

function tagHumanoid(humanoid,killer)
	
	if humanoid and killer then
		
		local tag = Instance.new("ObjectValue")
		tag.Name = "creator"
		tag.Value = killer
		tag.Parent = humanoid
	end
	
end

script.Parent.Handle.blade.Touched:connect(function(p)
	
local plr = game.Players:GetPlayerFromCharacter(tool.Parent)

if script.Parent.CanDamage.Value == true then

	script.Parent.CanDamage.Value = false
	
	local humanoid = p:FindFirstChild("Humanoid")

	p.Parent.humanoid:TakeDamage(Av)
	
	tagHumanoid(humanoid, plr)

	wait(1)

	script.Parent.CanDamage.Value = true

	if p.Parent.Humanoid.Health < 1 then
		print("Player Has Died")
	end

	end

end)