Alguem pode me ajudar com o oracle?

ta funcionando certinho para dar a vocaçâo mas o npc ta dando mais de uma vez a vocação tipo pego knight depois vou la e falo denovo e pego druid

o npc tem esse script aqui também nao sei se e por aqui

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)

function onCreatureAppear(cid)                npcHandler:onCreatureAppear(cid)            end
function onCreatureDisappear(cid)             npcHandler:onCreatureDisappear(cid)            end
function onCreatureSay(cid, type, msg)             npcHandler:onCreatureSay(cid, type, msg)        end
function onThink()                     npcHandler:onThink()                    end

function oracle(cid, message, keywords, parameters, node)
    if(not npcHandler:isFocused(cid)) then
        return false
    end

    local cityNode = node:getParent():getParent()
    local vocNode = node:getParent()

    local destination = cityNode:getParameters().destination
    local town = cityNode:getParameters().town
    local vocation = vocNode:getParameters().vocation

    if(destination ~= nil and vocation ~= nil and town ~= nil) then
        if(getPlayerLevel(cid) < parameters.level) then
            npcHandler:say('You must first reach level ' .. parameters.level .. '!', cid)
            npcHandler:resetNpc()
        else
            if(getPlayerVocation(cid) > 0) then
                npcHandler:say('Sorry, You already have a vocation!')
                npcHandler:resetNpc()
            else
                doPlayerSetVocation(cid, vocation)
                doPlayerSetTown(cid, town)
                npcHandler:resetNpc()

                local tmp = getCreaturePosition(cid)
                doTeleportThing(cid, destination)
                doSendMagicEffect(tmp, CONST_ME_POFF)
                doSendMagicEffect(destination, CONST_ME_TELEPORT)
            end
        end
    end

    return true
end

function greetCallback(cid)
    if(getPlayerLevel(cid) < 8) then
        npcHandler:say('COME BACK WHEN YOU GROW UP, CHILD!')
        return false
    else
        return true
    end
end
npcHandler:setCallback(CALLBACK_GREET, greetCallback)
npcHandler:setMessage(MESSAGE_GREET, 'Hello |PLAYERNAME|. Are you prepared to face your destiny?')

local yesNode = KeywordNode:new({'yes'}, oracle, {level = 8})
local noNode = KeywordNode:new({'no'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, moveup = 1, text = 'Then what vocation do you want to become?'})

local node1 = keywordHandler:addKeyword({'yes'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'What city do you wish to live in? {Rhyves}, {Varak} or {Jorvik}?'})
    local node2 = node1:addChildKeyword({'varak'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, town = 1, destination = {x=242, y=429, z=12}, text = 'Varak, eh? So what vocation do you wish to become? {Sorcerer}, {druid}, {paladin} or {knight}?'})
        local node3 = node2:addChildKeyword({'sorcerer'}, StdModule.say, {npcHandler = npcHandler, vocation = 1, onlyFocus = true, text = 'So, you wish to be a powerful magician? Are you sure about that? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'druid'}, StdModule.say, {npcHandler = npcHandler, vocation = 2, onlyFocus = true, text = 'Are you sure that a druid is what you wish to become? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'paladin'}, StdModule.say, {npcHandler = npcHandler, vocation = 3, onlyFocus = true, text = 'A ranged marksman. Are you sure? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'knight'}, StdModule.say, {npcHandler = npcHandler, vocation = 4, onlyFocus = true, text = 'A mighty warrior. Is that your final decision? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
    node2 = node1:addChildKeyword({'rhyves'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, town = 1, destination = {x=159, y=387, z=6}, text = 'Rhyves, eh? So what vocation do you wish to become? {Sorcerer}, {druid}, {paladin} or {knight}?'})
        node3 = node2:addChildKeyword({'sorcerer'}, StdModule.say, {npcHandler = npcHandler, vocation = 1, onlyFocus = true, text = 'So, you wish to be a powerful magician? Are you sure about that? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'druid'}, StdModule.say, {npcHandler = npcHandler, vocation = 2, onlyFocus = true, text = 'Are you sure that a druid is what you wish to become? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'paladin'}, StdModule.say, {npcHandler = npcHandler, vocation = 3, onlyFocus = true, text = 'A ranged marksman. Are you sure? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'knight'}, StdModule.say, {npcHandler = npcHandler, vocation = 4, onlyFocus = true, text = 'A mighty warrior. Is that your final decision? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
    node2 = node1:addChildKeyword({'jorvik'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, town = 1, destination = {x=469, y=172, z=7}, text = 'Jorvik, eh? So what vocation do you wish to become? {Sorcerer}, {druid}, {paladin} or {knight}?'})
        node3 = node2:addChildKeyword({'sorcerer'}, StdModule.say, {npcHandler = npcHandler, vocation = 1, onlyFocus = true, text = 'So, you wish to be a powerful magician? Are you sure about that? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'druid'}, StdModule.say, {npcHandler = npcHandler, vocation = 2, onlyFocus = true, text = 'Are you sure that a druid is what you wish to become? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'paladin'}, StdModule.say, {npcHandler = npcHandler, vocation = 3, onlyFocus = true, text = 'A ranged marksman. Are you sure? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
        node3 = node2:addChildKeyword({'knight'}, StdModule.say, {npcHandler = npcHandler, vocation = 4, onlyFocus = true, text = 'A mighty warrior. Is that your final decision? This decision is irreversible!'})
            node3:addChildKeywordNode(yesNode)
            node3:addChildKeywordNode(noNode)
keywordHandler:addKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'Then come back when you are ready.'})

npcHandler:addModule(FocusModule:new())