Trying to create a table of players but it only works once?

So, I have achieved in which on touch it would add a player to a folder in which they would be a stringValue with their name in which I would know who to teleport to the main game.

For some reason, it's able to add but after removing the player once they have exited the platform, the script breaks.

  13:25:28.816 - Workspace.GameZone.GameZoneScript:47: attempt to index a nil value

and I get this. I know that means it can't find the player but how do I fix this?!

EDIT: fixed most problems, now it just won't loop.

local EnterBrick = script.parent.EnterZone
local PlayersToTeleport = {}
local tablesman = script.Parent.Lobby
local ExitBrick = script.Parent.ExitZone

EnterBrick.Touched:Connect(function(TouchedPart)
	numberOfElements = 0
		for key, value in pairs(PlayersToTeleport) do
   		 numberOfElements = numberOfElements + 1
		script.Parent.Screen.SurfaceGui.Frame.Players.Text = numberOfElements.."/6"
		end
	if TouchedPart.Parent:FindFirstChild("Humanoid") then
		local Character = TouchedPart.Parent
		local Player = game.Players:GetPlayerFromCharacter(Character)
		local AlreadyInTable = false
		for _,OtherPlayer in next,PlayersToTeleport do
			if OtherPlayer == Player then
				AlreadyInTable = true
			end
		end
		if not AlreadyInTable then
			print(Player)
		code = Instance.new("StringValue", tablesman)
		code.Name = Player.Name
		table.insert(PlayersToTeleport,Player)
		end
	end
end)

--[[ExitBrick.Touched:Connect(function(TouchedPart)
	if TouchedPart.Parent:FindFirstChild("Humanoid") then
		local Character = TouchedPart.Parent
		local Player = game.Players:GetPlayerFromCharacter(Character)
		tablesman:FindFirstChild(Player.Name):Destroy()
		table.remove(PlayersToTeleport,Player)
		end
end)]]

ExitBrick.TouchEnded:Connect(function(TouchedPart)
	if TouchedPart.Parent:FindFirstChild("Humanoid") then
		local Character = TouchedPart.Parent
		local Player = game.Players:GetPlayerFromCharacter(Character)
		local AlreadyInTable = true
		for _,OtherPlayer in next,PlayersToTeleport do
			if OtherPlayer == Player then
				AlreadyInTable = false
			end
		end
		if not AlreadyInTable then
			local remove = tablesman:FindFirstChild(Player.Name)
			 if remove then
				print(Player.Name.."Removed")
				    for i, name in ipairs(PlayersToTeleport) do
       		 if name == Player.Name then
           		 table.remove(PlayersToTeleport, i)
           		 break
       			 end
    			end
				remove:Destroy()
       	 return remove 
  		  else
      	 return false
		end
		end
	end
end)
--script.Parent.Screen.SurfaceGui.Frame.Players.Text = numberOfElements.."/6"