Attempt to index local m (a nil value) Fix?

i'm scripting a game for finobe, i'm scripting for a message status thingy and i get

15:46:09.698 - Workspace.Killer:517: attempt to index local 'm' (a nil value) 15:46:09.701 - Stack Begin 15:46:09.702 - Script 'Workspace.Killer', Line 517 15:46:09.703 - Stack End

here's the script (the script may have deprecated things because it is for finobe)

function chooseMap()

	--print(table.maxn(minigames))
	--if table.maxn(minigames) < 1 then
		--refill list
		local maps = {}

		mm = game.Lighting.Maps:GetChildren()
		for i=1,#mm do
			if mm[i].className == "Model" and mm[i]:findFirstChild("PickMe") == nil then
				table.insert(maps,mm[i])
				end
			end
		--end

	if game.Workspace.ChosenMapy.Debounce == "None" then
		local randommultiplier = math.random(80,100)
		local t = .01
		local pick = math.random(1,#maps)
		local times = 0
		while true do  -- The following just makes map picking fun
			SlashSound:play()
			if pick > #maps then
				pick = 1
				end

			local m = (maps[pick]) -- (colors[math.random(1,#colors)])
			displayaMessage("--> " .. m.Name .. " <--",t)
			times = times + 1

			if times > 15 then
				t = t*2
				times = 0
				print("Slower")
				end

			randommultiplier = randommultiplier - 1

			if randommultiplier < 1 then 
			print(maps[pick].Name .. ", " .. m.Name)
			table.remove(maps, pick) --no repeating
			return m 
			end

			pick = pick + 1

			--SlashSound:stop()
			end
		else 

		local m = game.Lighting.Maps:findFirstChild(game.Workspace.ChosenMapy.Debounce)
		return m
		end
	end

while true do
	

	wait(3)
	if reachForPlayers() == true then
		wait(1)

		if chooserdebounce.Value == false and elevatordebounce == true then
			displayaMessage("The next minigame is being chosen by a player (20 more seconds for him/her to choose)...")
			wait(20)
			noMoreChoosing()
			else
			noMoreChoosing()
			displayaMessage("Choosing a map...")
			end

		local m = chooseMap()
		game.Workspace.ChosenMap.Value = "None"
		displayaMessage(" --> " .. m.Name .. " <-- ") -- sound laggg
		Yay:play()
		wait(.8)
		displayaMessage("-->   " .. m.Name .. "   <--")
		wait(.4)
		displayaMessage(" --> " .. m.Name .. " <-- ")
		wait(.4)
		displayaMessage("-->   " .. m.Name .. "   <--")
		wait(.4) -- Just showing that it picked a map
		displayaMessage(" --> " .. m.Name .. " <-- ")
		wait(.4)
		displayaMessage("-->   " .. m.Name .. "   <--")
		wait(.4)
		displayaMessage(" --> " .. m.Name .. " <-- ")
		wait(.4)
		wait(1)
		displayaMessage("The game will start soon.", 3)
		--Hint(m.Name .. " ~~ Origin: " .. m.Origin.Value .. ".

		wait(1)
		print("Getting teh map")
		m = loadMap(m)
		print("Getting teh players")
		wait(1)

		sp = {}
		local spawns = m:GetChildren()
		for i=1,#spawns do
			if spawns[i].Name == "Spawn" then
				table.insert(sp,spawns[i])
				end
			end

		game.Workspace.Controller.Value = nil

		getWillingPlayers(sp)

		displayaMessage("Ready to survive?")
		wait(2)
		displayaMessage("Go!")
		wait(.5)