ERRO NO NPC QUANDO VAI VENDER ITENS ÚNICO , O NPC SÓ COMPRA ITENS STACKADOS !

TFS 0.3.6

[08/04/2019 19:27:39] data/npc/lib/npcsystem/modules.lua:1229: bad argument #2 to 'error' (number expected, got string)
[08/04/2019 19:27:39] stack traceback:
[08/04/2019 19:27:39]     [C]: in function 'error'
[08/04/2019 19:27:39]     data/npc/lib/npcsystem/modules.lua:1229: in function 'callbackOnSell'
[08/04/2019 19:27:39]     data/npc/lib/npcsystem/npchandler.lua:265: in function 'processModuleCallback'
[08/04/2019 19:27:39]     data/npc/lib/npcsystem/npchandler.lua:450: in function 'onSell'
[08/04/2019 19:27:39]     data/npc/lib/npcsystem/modules.lua:1296: in function <data/npc/lib/npcsystem/modules.lua:1295>