[MC-45056] Hopper: java.lang.NullPointerException: Loading entity NBT

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-1008120/

Crash:

java.lang.NullPointerException: Loading entity NBT
	at ww.a(SourceFile:222)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 16/01/14 18:20
Description: Loading entity NBT

java.lang.NullPointerException: Loading entity NBT
	at ww.a(SourceFile:222)
	at rl.f(SourceFile:1197)
	at agr.a(SourceFile:131)
	at agr.c(SourceFile:104)
	at apw.n(SourceFile:54)
	at ahc.i(SourceFile:1286)
	at nd.i(SourceFile:393)
	at net.minecraft.server.MinecraftServer.u(SourceFile:527)
	at net.minecraft.server.MinecraftServer.t(SourceFile:461)
	at bvz.t(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:377)
	at lt.run(SourceFile:647)


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

-- Head --
Stacktrace:
	at ww.a(SourceFile:222)

-- Entity being loaded --
Details:
	Entity Type: FallingSand (ww)
	Entity ID: 21
	Entity Name: Falling Block
	Entity's Exact location: 562,50, 92,50, 7,50
	Entity's Block location: 562,00,92,00,7,00 - World: (562,92,7), Chunk: (at 2,5,7 in 35,0; contains blocks 560,0,0 to 575,255,15), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
	Entity's Momentum: 0,00, 0,06, 0,00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
	Immitating block ID: -1
	Immitating block data: 0
Stacktrace:
	at rl.f(SourceFile:1197)
	at agr.a(SourceFile:131)
	at agr.c(SourceFile:104)
	at apw.n(SourceFile:54)

-- Block entity being ticked --
Details:
	Name: MobSpawner // apw
	Block type: ID #52 (tile.mobSpawner // amf)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (562,90,9), Chunk: (at 2,5,9 in 35,0; contains blocks 560,0,0 to 575,255,15), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
	Actual block type: ID #52 (tile.mobSpawner // amf)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at ahc.i(SourceFile:1286)
	at nd.i(SourceFile:393)

-- Affected level --
Details:
	Level name: world
	All players: 1 total; [ng['Mlakuss'/19, l='world', x=556,82, y=94,37, z=-6,07]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: -119876498719870
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 562,00,93,00,-10,00 - World: (562,93,-10), Chunk: (at 2,5,6 in 35,-1; contains blocks 560,0,-16 to 575,255,-1), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
	Level time: 297466594 game time, 6000 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 7716 (now: false), thunder time: 146489 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:527)
	at net.minecraft.server.MinecraftServer.t(SourceFile:461)
	at bvz.t(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:377)
	at lt.run(SourceFile:647)

-- System Details --
Details:
	Minecraft Version: 14w03b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 144477920 bytes (137 MB) / 288620544 bytes (275 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ng['Mlakuss'/19, l='world', x=556,82, y=94,37, z=-6,07]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.