Which exactly the version you have? I tested it with 2017-04-26 and everything is OK, I can enter text only rows. Do you really have the VAT code column empty on the text row?
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...
