Por favor, me ajudem a resolver isso:

[Error - NpcScript Interface]
(Unknown script file)
Description:
data/npc/lib/npcsystem/modules.lua:1229: attempt to compare boolean with number
stack traceback:
        data/npc/lib/npcsystem/modules.lua:1229: in function 'callbackOnBuy'
        data/npc/lib/npcsystem/npchandler.lua:298: in function 'processModuleCallback'
        data/npc/lib/npcsystem/npchandler.lua:504: in function 'onBuy'
        data/npc/lib/npcsystem/modules.lua:1346: in function <data/npc/lib/npcsystem/modules.lua:1345>
 

Script please.