HELP NPC XODET "15:40 You cant buy it so fast"

Hail all

i have this problem,my npc xodet give this errror in console when a player buys something very fast:

[3/5/2020 15:40:24] [Error - NpcScript Interface]
[3/5/2020 15:40:24] (Unknown script file)
[3/5/2020 15:40:24] Description:
[3/5/2020 15:40:24] data/npc/lib/npcsystem/modules.lua:1229: attempt to compare boolean with number
[3/5/2020 15:40:24] stack traceback:
[3/5/2020 15:40:24] data/npc/lib/npcsystem/modules.lua:1229: in function 'callbackOnBuy'
[3/5/2020 15:40:24]...

HELP NPC XODET "15:40 You cant buy it so fast"