How do I check if a player name isn't in a table? [SOLVED]

local touchedplayers = {}

function CheckPlayerList(PlayerName,List) 	--This checks is a player is in the specified list
	for _,v in pairs(List) do				--This goes through the list
		if v == PlayerName then			--This checks if the list has the players name in
			print(PlayerName .. ' is already in the list')
			return true				--This returns true if the player is in the list
		end
	end
end

local cooldown = false
script.Parent.Touched:connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
		if CheckPlayerList(hit.Parent.Name,touchedplayers) or cooldown then return end	--This line will stop the script going further if the players name is already in the list or if cooldown is true
        cooldown = true
        table.insert(touchedplayers,hit.Parent.Name)
		print(hit.Parent.Name .. ' successfully added to the list')
        game.Players[hit.Parent.Name].PlayerGui.TextLoader.UserText.Visible = true
        loop()
    end
end)

From what I see, your issue is "for i,v in pairs (touchedplayers) do", which is trying to go through a list which has nothing in it yet, so the part of the script after it won't run unless something's added to the list. There was no output shown as the script runs fine, it was your method at fault. Hope this helps