I get this crash sometimes when I travel the world. The last time I got it I watched an AgriCraft tank. I don't know what cause it. http://pastebin.com/egAPdMuP

This has been reported multiple times already, check the tracker before you report an issue please.

i have same problem, I was traveling by boat and the game ended suddenly
the mod is the lib or agricraft
http://pastebin.com/iTjYqmDC