Hopper: java.lang.NullPointerException: Ticking block entity

java.lang.NullPointerException: Ticking block entity
	at amg.a(SourceFile:376)
	at bcz.a(SourceFile:101)
	at bdb.c(SourceFile:429)
	at bdb.a(SourceFile:390)
	at bdb.r(SourceFile:251)
	at bdb.m(SourceFile:198)
	at bdb.c(SourceFile:185)

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 18/08/14 16:28
Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
	at amg.a(SourceFile:376)
	at bcz.a(SourceFile:101)
	at bdb.c(SourceFile:429)
	at bdb.a(SourceFile:390)
	at bdb.r(SourceFile:251)
	at bdb.m(SourceFile:198)
	at bdb.c(SourceFile:185)
	at aqr.i(SourceFile:1311)
	at qt.i(SourceFile:479)
	at net.minecraft.server.MinecraftServer.z(SourceFile:607)
	at net.minecraft.server.MinecraftServer.y(SourceFile:531)
	at cyd.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
	at amg.a(SourceFile:376)
	at bcz.a(SourceFile:101)
	at bdb.c(SourceFile:429)
	at bdb.a(SourceFile:390)
	at bdb.r(SourceFile:251)
	at bdb.m(SourceFile:198)
	at bdb.c(SourceFile:185)

-- Block entity being ticked --
Details:
	Name: Hopper // bdb
	Block type: ID #154 (tile.hopper // awu)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-215,64,348), Chunk: (at 9,4,12 in -14,21; contains blocks -224,0,336 to -209,255,351), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Actual block type: ID #154 (tile.hopper // awu)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at aqr.i(SourceFile:1311)
	at qt.i(SourceFile:479)

-- Affected level --
Details:
	Level name: Mundo nuevo
	All players: 1 total; [qw['jordix84bcn'/308, l='Mundo nuevo', x=-211,26, y=62,00, z=347,14]]
	Chunk stats: ServerChunkCache: 569 Drop: 0
	Level seed: 3546935070863043340
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: -236,00,64,00,244,00 - World: (-236,64,244), Chunk: (at 4,4,4 in -15,15; contains blocks -240,0,240 to -225,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 675254 game time, 780798 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 73588 (now: false), thunder time: 47690 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.z(SourceFile:607)
	at net.minecraft.server.MinecraftServer.y(SourceFile:531)
	at cyd.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w34a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 169319344 bytes (161 MB) / 414265344 bytes (395 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [qw['jordix84bcn'/308, l='Mundo nuevo', x=-211,26, y=62,00, z=347,14]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.