That certainly is an unwelcome experience. The link did not work directly, but I managed to open it by deleting the studio and editor from the link. Nothing out of the ordinary there. The next level is most likely the castle, so it seems like something went wrong with its generation, and NetHack does not seem to recover very well from such cases. It would be great if you could upload all the level files in the GnollHack directory, if they are still there (sometimes they get deleted if the recovery fails, which may be the case here), so I can have a look, what's the problem there. I tested a similar scenario, and all worked fine. I did fix a few bugs after the Pre-alpha 2 release, but I don't think any of them would crash the game in this sort of a situation. If we find the cause, I can make a hotfix to the Pre-alpha 2.