Auto promote bug

[NilssoN042]

I have got a problem whit this script! Its an auto promote script!

The problem is that everytime someoen advance in level they get a message that says,

You have been promoted to (Vocname)

I only want it to say it when they get lvl 20. Not when they advance more..

  local config = {
    promoLevel = 1,      -- promotion level : )
    needLevel = 20,      -- level to get promotion
    needPremium = "yes"  -- need premium (YES/NO)? :D
}

function onAdvance(cid, skill, oldlevel, newlevel)
        local promoLevel = nil
        if (skill == 0) and (newlevel >= config.needLevel) and getPlayerPromotionLevel(cid) < config.promoLevel then
                if config.needPremium == "yes" then
                        if isPremium(cid) == TRUE then
                                promote = TRUE
                        end
                elseif config.needPremium == "no" then
                        promote = TRUE
                else
                        error('AUtoPromote: You have to enter "yes" or "no"')
                end
        end
        if promote ~= nil then
                setPlayerPromotionLevel(cid, config.promoLevel)
                doPlayerSendTextMessage(cid, 22, "You have been promoted to " .. getVocationInfo(getPlayerVocation(cid)).name .. ".")
        end
        return TRUE
end