There seems to be a crasher bug in 1,11 as you fight the slimes.
The log goes (partial quote) :
Code:
【可変DB】エラー:存在しないタイプ番号 41 を読みに行っています
Ev2 Common705 Line21 DBの存在しない部分を読みに行こうとしました
このDBにタイプ41は存在しません、対象DBを間違えていないかご確認下さい
Also, not a crasher, but kinda soft-lock - if you pick second option from the diary submenu, you're forced to reset the game as it simply repeatedly prints errors.
Oops: that's not only the same bug, but it's a well known one, even if the author didn't figure out a proper fix yet - this is why the game is shipped with a System.sav file.