Thank you!
After googling for a while last night I found this info:
Change:
if type(dataList['sales'][i]['timestamp']) ~= 'number' or dataList['sales'][i]['timestamp'] < epochBack then
to:
if type(dataList['sales'][i]['timestamp']) ~= 'number' or dataList['sales'][i]['timestamp'] < epochBack or dataList['sales'][i]['guild'] == nil then
in MasterMerchant.lua in the MasterMerchant:TruncateHistory() function.
I made the change last night and it seemed to make the error go away, however I've not actually gone to an auctioneer to test is out. I wish I could code
I'll try the above as well!