Server crashes after interacting with a brewing stand

• Multiplayer/survival on private vanilla server

• Client is vanilla aswell, running latest snapshot

• Placed two brewing stands

• Made awkward potions (success)

• Tried adding sugar to one of the brewing stands

• Interface froze + server timeout/crash after a few seconds

• After first server restart I felt out of the world (disconnected at y=-600)

• Another server restart, instant crash

• Deleted user file, server restart, seems fine, crashes when I believe affected chunk gets in sight

• Last crash report below

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 6/26/13 4:34 PM
Description: Ticking tile entity

java.lang.NullPointerException
	at arp.l(SourceFile:106)
	at arp.h(SourceFile:63)
	at abq.h(SourceFile:1268)
	at jo.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at io.t(SourceFile:262)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at he.run(SourceFile:582)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at arp.l(SourceFile:106)
	at arp.h(SourceFile:63)

-- Tile entity being ticked --
Details:
	Name: Cauldron // arp
	Block type: ID #117 (tile.brewingStand // amv)
	Block data value: 7 / 0x7 / 0b0111
	Block location: World: (-369,66,-17), Chunk: (at 15,4,15 in -24,-2; contains blocks -384,0,-32 to -369,255,-17), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Actual block type: ID #117 (tile.brewingStand // amv)
	Actual block data value: 7 / 0x7 / 0b0111
Stacktrace:
	at abq.h(SourceFile:1268)
	at jo.h(SourceFile:364)

-- Affected level --
Details:
	Level name: infinite
	All players: 1 total; [jr['#PRIVATE#'/190, l='infinite', x=-272.47, y=68.42, z=143.89]]
	Chunk stats: ServerChunkCache: 779 Drop: 0
	Level seed: -1913421784
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-184,64,252), Chunk: (at 8,4,12 in -12,15; contains blocks -192,0,240 to -177,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 74093019 game time, 4016 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 105786 (now: false), thunder time: 15452 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at io.t(SourceFile:262)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at he.run(SourceFile:582)