Quest viper star problem

[Ekholmen]

I made a quest wich is the hardest on my server, and the reward is viper star and some other weps but here is the problem:

I want the reward to be _ONE_ Viper star not a stack with 100 stars...

How to fix xD?

 

[Animera]

function onUse(cid, item, frompos, item2, topos)
queststatus = getPlayerStorageValue(cid, 7366)
if queststatus == -1 then
doPlayerSendTextMessage(cid,22,"You have found a viper star.") 
doPlayerAddItem(cid, 7366, 1)
setPlayerStorageValue(cid, 7366, 1)
else
doPlayerSendTextMessage(cid,22,"It is empty.")
end
return TRUE
end

Here you go.