I see in the db you attached there are 7 bad rules. So it is a corrupted DB. I still don’t understand how you managed to produce it (maybe it is a problem caused by an earlier version of tabbles, which did not clear the rules when you imported a new database, so you ended up having rules which you shouldn’t have had).
Anyway, in version 1.3.7 I added an integrity check to deal with your problem. Here’s what you can do: download and install version 1.3.7, choose tools > advanced > remove errors in db. 7 bad rules will be removed. ( I just tried). And from then on, your DB will be sound (= not corrupted). Then you have will be able to work.
If, after doing this, you are still able to make it crash, please let me know. Thank you. 🙂