I did a search but most of the results I found are reasonably old. Might be classed as a duplicate, but it seemed pretty easy to cause and may be more severe in the snapshot.
I literally have no idea on this one, although I expect it was an overlook on a random number somewhere.
I was testing out the new customised worlds, and when generating one for the first time it froze on the loading screen and the console said it had crashed. World was pretty normal apart from low sea level and very high dungeon count, which I presume would be the most likely cause of the crash.
Sorry it's a big vague, there is very little information I know myself. Even the crash log is pretty short.
Hope it helps though!