Sacrificing multiple creatures with blood knives freezes the game

I just started taking advantage of the new use of blood knives for the +300 creature knowledge per creature sacrificed. I have noticed that if I keep sacrificing creatures without exiting the sacrifice interface to let the knowledge/achievements update, that the game will stall indefinitely. The sprites on screen move, but I am unable to exit the sacrifice interface. The only way out is to close the program and restart.

Version .19
Windows 7

Thanks, fixed for the next patch!