Having the same issue right now.
From what I've read (rather, scrapped) from the patch notes, it seems there is a couple of bugs right now :
- Game can crash whenever, anywhere. Can be because of sound; try turing all off, AND edit config.ini to put voice to 0.
- Game can crash after you upgrade too much your rooms, or have too many characters; 21 of either may make it crash, try not to upgrade rooms too much, or get too many characters.
- Game WILL crash it seems when your club ranks up during a night, from 9 to 10 (or is it 10 to 11?) I've confirm it, and am stuck on this one right now, not sure what can you do, as I assume you get club experience only from the customers at night...
- There is a couple of other bugs I don't understand the meaning translating rougly the japanese other than those 3, sorry.
Anyway, it seems there is both a 1.01 and 1.02 version for the add-on, but it's so recent it's hard to put your hand on them it seems. We'll see with time, I guess, and hope for the best...