MM UI Error
 

I get this error:

user:/AddOns/MasterMerchant/MasterMerchant_Guild.lua:214: operator < is not supported for nil < number
stack traceback:
user:/AddOns/MasterMerchant/MasterMerchant_Guild.lua:214: in function 'MMGuild:addSaleByDate'
user:/AddOns/MasterMerchant/MasterMerchant.lua:3001: in function 'MasterMerchant:InitPurchaseHistory'
user:/AddOns/MasterMerchant/MasterMerchant.lua:2591: in function 'MasterMerchant:Initialize'
user:/AddOns/MasterMerchant/MasterMerchant.lua:3191: in function 'OnAddOnLoaded'

but i've noticed that i only get this error with the game on English Language, and in german and french, the addon works perfectly. I've already tried to reinstall too.

Can someone help?