I am using the latest version of Botania. This has not happened when I used the unofficial version. Hitting an entity, including yourself, with the livingwood bow results in a crash of the game and server.

Below is a pastebin of the crash:
http://pastebin.com/M1wb05iq

alright, I'm very sorry! Thank you for helping me out!

at arc.bloodarsenal.compat.baubles.ItemSelfSacrificeAmulet.selfSacrificeHandler(ItemSelfSacrificeAmulet.java:61)

it's another mod