Anti-TeamKiller script does not damage NPCs?

Hello,

EDIT: Original anti-TK script was sorted out, reposting the now correct script with the new weird issue.

I have a sword script, thanks to user ScrewDeath, I was able to fix the error. But now, I can not inflict damage on NPCs who all have the "Humanoid" property. Do I need to set them to a team?

Error is: 00:42:31.079 - Players.Player1.Backpack.BasicSword.SwordScript:6: attempt to index local 'TargetPlayer' (a nil value)

Damage section of the Sword Script:

handle.Touched:connect(function(hit)
local humanoid = hit.Parent:FindFirstChild("Humanoid")
if humanoid then
local TargetPlayer = game.Players:GetPlayerFromCharacter(humanoid.Parent)
    if equipped and character and humanoid and humanoid.Health > 0 and hit and not hit:isDescendantOf(character) then
        if  humanoid and  humanoid.Health > 0 and not hithumanoids[humanoid] and (TargetPlayer.TeamColor ~= player.TeamColor or not TargetPlayer)
            then
            hithumanoids[ humanoid] = true

            for _, v in pairs( humanoid:GetChildren()) do
                if v and v.Name == "creator" then
                    v:remove()
                end
            end
            local tag = Instance.new("ObjectValue")
            tag.Name = "creator"
            tag.Value = player
            debris:AddItem(tag, 3)
            tag.Parent =  humanoid
             humanoid:TakeDamage(damage * (combo + 1))
            else

        end 
    end 
    end
end)