Trade box when talking to npc [lua]

[pioncz]

This is my lua script on my npc. I want to make npc who trade only with premium players and some storage id. Everythings alright withoud shopmodule. When i talk to npc, i see trade box with boots of haste, but i cant buy any of them. I have money, no errors appears on console or in game. Please help.

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
 
local shopModule = ShopModule:new()
npcHandler:addModule(shopModule)
 
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
 
-- Storage IDs --
local quest = 20053
 
 
local premium = 'You need premium account for this.'
local noitems = 'You dont have items.'
local bring = 'First do quest.'
 
 
function trejd(cid, message, keywords, parameters, node)
 
	if(not npcHandler:isFocused(cid)) then
		return false
	end
shopModule:reset()
	if isPremium(cid) then
		local sss = getPlayerStorageValue(cid,quest)
		if sss == 1 then
			shopModule:addBuyableItem({'boots of haste'}, 2195, 1000, 'boots of haste')
		else
			selfSay(bring)
		end
	else
			selfSay(premium)
	end
	return true
 
end
 
-- ASSASSIN END --
 
keywordHandler:addKeyword({'help'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = "I can sell boh for you, but first you must have done boh quest. Ask for {trade} when you have done it."})
 
keywordHandler:addKeyword({'trade'}, trejd, {npcHandler = npcHandler, onlyFocus = true})
 
local node1 = keywordHandler:addKeyword({'trades'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true})
node1:addChildKeyword({'yes'}, trejd, {npcHandler = npcHandler, onlyFocus = true, reset = true})
node1:addChildKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'Alright then. Come back when you got the neccessary items.', reset = true})
 
npcHandler:addModule(FocusModule:new())