Quando uso esse script em sqlite, funciona normalmente, porem quando mudo para mysql acontece o error.

Script:

function getRankStorage(cid, value, max, RankName) -- by vodka
local str =""
str = "--[".. (RankName == nil and "RANK STORAGE" or ""..RankName.."") .."]--\n"
local query = db.getResult("SELECT `player_id`, `value` FROM `player_storage` WHERE `key` = "..value.." ORDER BY cast(value as INTEGER) DESC;")
if (query:getID() ~= 1) then k = 1 repeat if k > max then break end
str = str .. "\n " .. k .. ". "..getPlayerNameByGUID(query:getDataString("player_id")).." - [" .. query:getDataInt("value") + 1 .. "]"
k = k + 1 until not query:next() end return doShowTextDialog(cid, 7701, str)
end

function onUse(cid, item)
local storage,name = 123781, "Rank ganhadores Torneio PvP"
return getRankStorage(cid, storage, 20, name)
end

Error quando usa em mysql:

[Error - Action Interface] 
data/actions/scripts/rank torneio pvp.lua:onUse
Description: 
data/lib/004-database.lua:76: [Result:getDataString] Result not set!
stack traceback:
        [C]: in function 'error'
        data/lib/004-database.lua:76: in function 'getDataString'
        data/actions/scripts/rank torneio pvp.lua:6: in function <data/actions/scripts/rank torneio pvp.lua:1>
        (tail call): ?

Tópico movido para a seção de dúvidas e pedidos resolvidos.