Can't invite in a party player who wanna buy somthing

So, steps to reproduce:
1) You get a message from the buyer
2) You answered to buyer and his name is displayed at the chat (like: @getmymoney)
3) Try to invite him in party


Result:
You can't open menu and can't invite the buyer to the party.

I am also having this issue. keep missing trades because i'm unable to invite the person requesting to buy.