no need for log, after you upgrade card, came for some reason request all the cards from server again, if it go wrong because of server overload, or some other reason the game do not get answer containing all cards, and I would expect the game crash (it crash on most errors). After successful login everything should be fine.
this bug is already fixed for new characters, I lost part of code, that was preventing name duplicates, by accident
Boorino think he can fix it with SQL, but then run to some problems, so there is still 78*N characters with that problem