[AJUDA] Erro no Tile

[3/6/2016 17:36:10] [Error - MoveEvents Interface] 
[3/6/2016 17:36:10] data/movements/scripts/aviso.lua:onStepIn
[3/6/2016 17:36:10] Description: 
[3/6/2016 17:36:10] data/movements/scripts/aviso.lua:22: attempt to concatenate a nil value
[3/6/2016 17:36:10] stack traceback:
[3/6/2016 17:36:10]     data/movements/scripts/aviso.lua:22: in function <data/movements/scripts/aviso.lua:11>

E Aqui Esta o Script

function isPlayerGuild(cid)
	return getPlayerGuildName(cid) ~= "" and true or false
end
function getGuildNameById(id) -- by Vodka
	local query = db.getResult("SELECT `name` FROM `guilds` WHERE `id` = "..id)
	if query:getID() ~= -1 then
		return query:getDataString("name")
	end
	return nil 
end 
function onStepIn(cid, item, position, fromPosition)
	local castle_one_name = "Castle24Horas" -- Nome do castelo 1
	local storages = {154154, 54321, 123123} -- Storages ( se vc eh iniciante)
	local sto_ativ = getGlobalStorageValue(storages[2])
	local position = getCreaturePosition(cid)
	if isPlayerGuild(cid) then
		if sto_ativ == 1 or sto_ativ == -1 then
			guildname = getPlayerGuildName(cid) 
			guild = getPlayerGuildId(cid) 
			guild_sto = getGlobalStorageValue(storages[3])
			if guild ~= guild_sto then 
				doBroadcastMessage("O Jogador: "..getCreatureName(cid)..", da GUILD: "..guildname..", Esta invadindo o "..castle_one_name..", Aviso #Donos Atuais: "..getGuildNameById(getGlobalStorageValue(storages[3])), 27)
			else
				doPlayerSendCancel(cid,"O Castelo pertence a sua guild.")
			end
		else
			doPlayerSendCancel(cid,"O Castelo pertence a sua guild.")
		end 
	else
		doPlayerSendCancel(cid,"O Castelo pertence a sua guild.")
	end
	return true
end

Alguem Poderia me Ajudar?

Valendo Sempre +REP