This suddenly doesn't work when it previously did?

So, the other day I was working on my script that was supposed to serve as when some player randomly joined in. I've run down the lines and saw that when a player connects, the script won't even run even when it previously did. Can someone tell me what happened?

game.Players.PlayerAdded:connect(function(plr)
	local GroupID = getGroupId(plr)
	PlayerRanks(plr, GroupID)
end)

All the functions are there and are working when run through ways that are not using the first line, however the first line in this snippit doesn't work. I even used the print command to track down the problem, and it was that first line. No errors are produced from this, and I'm not sure why it isn't working. Can someone help me?

EDIT: As per request here is the rest of the script:

local allies = game:GetService("GroupService"):GetAlliesAsync(2553045)
local enemies = game:GetService("GroupService"):GetEnemiesAsync(2553045)
local friendlies = {}
local spies = {}

function AboveText(plr, GroupID)
	if GroupID then
		local rank = plr:GetRoleInGroup(GroupID)
		return rank
	else
		local rank = "Visitor"
	end
end

function setAffiliations()
	for i, v in pairs(allies:GetCurrentPage()) do
		table.insert(friendlies, v.groupId)
		if not allies.IsFinished then
			allies:AdvanceToNextPageAsync()
		end
	end
	for i, v in pairs(enemies:GetCurrentPage()) do
		table.insert(spies, v.groupId)
		if not enemies.IsFinished then
			enemies:AdvanceToNextPageAsync()
		end
	end
end

function getGroupId(plr)
	setAffiliations()
	if plr:IsInGroup(2553045) then
		return "2553045"
	else
		for i, v in pairs(friendlies) do
			if plr:IsInGroup(v) then
				return v
			else
				for q, a in pairs(enemies) do
					if plr:IsInGroup(a) then
						return a
					end
				end
			end
		end
	end
end

function PlayerRanks(plr, GroupID)
	repeat wait() until
		plr.Character
	local gui = Instance.new("BillboardGui", plr.Character.Head)
	gui.Size=UDim2.new(4, 0, 4, 0)
	gui.StudsOffset=Vector3.new(0, 2, 0)
	local text = Instance.new("TextBox", gui)
	text.Position = UDim2.new(0, -150, 0, 0)
	text.Size = UDim2.new(1, 300, 1, 0)
	text.Text = AboveText(plr, GroupID)
	text.FontSize = "Size24"
	text.TextColor3 = Color3.new(0, 0, 0)
	text.TextTransparency = 0.4
	text.TextWrapped = true
	text.BackgroundTransparency = 1
end

EDIT 2: Supposedly testing this out in roblox studio is the problem. It works in a game server. Asking for deletion from staff members.