How can I fix a whitelisting script when rejoining the game makes it not work?

It is kind of difficult to write it in a sentence for people to understand. Recently I have been trying to make a script in which anyone who isn't in a designed whitelist will have a NPC target them down, which will cause them to get kicked on touch. It worked, but when they rejoin or another person joins. The NPC does not spawn in. Sort of need some help in regards to this.

Here is the script I had trouble on

--Whitelist script by fridayboycool : Modified by XenilMatrix [HUGE CREDITS TO OWNER]
local whitelisted = {
	["XenilMatrix"] = true;
	[""] = true;
	["Player1"] = true;
}

local player = script.Parent.Parent
local teams = game.Teams

--------------------------------------------------------------------------------------------------------------------

while true do
	wait(0.01)
	if whitelisted[player.Name] then 
	else -- 2020/3/31 Got it working but failure to repeat again when another invalid person joins the game, but they are not listed.
		while true do
			wait(0.001)
		if #teams.Players:GetPlayers() > 0 then
			local Object = game.ReplicatedStorage["NPC"]:Clone()
			Object.Parent = game.Workspace
			Object.Position = Vector3.new()
			Object:MoveTo(Vector3.new(0,0,0))
			wait(0.001)
			end
		end
	end
end

I'm confused as to why you don't do this on the server. I don't understand any of your bot stuff so I'll just have you do that manually

Disclaimer: Put this in a script on the server

local whitelisted = {
	    ["XenilMatrix"] = true;
	    [""] = true;
            ["Player1"] = true;
}
game.Players.PlayerAdded:Connect(function(player)
	local character = player.Character or player.CharacterAdded:Wait()
	local touched = false
	if not whitelisted[player.Name] then
		while true do
			wait()
			##Bot following player here
			
		end
	end
end)

I should probably break the loop as soon as the player gets kicked but I can't be bothered to test if it would work.

Make sure to tell me if this helps