Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-197007/

Crash:

java.lang.NullPointerException
	at azq.a(SourceFile:76)
	at bbo.a(SourceFile:159)

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

---- Minecraft Crash Report ----
// My bad.

Time: 20/09/13 21:14
Description: Rendering screen

java.lang.NullPointerException
	at azq.a(SourceFile:76)
	at bbo.a(SourceFile:159)
	at bii.b(SourceFile:844)
	at awp.aa(SourceFile:754)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at azq.a(SourceFile:76)
	at bbo.a(SourceFile:159)

-- Screen render details --
Details:
	Screen name: bbo
	Mouse location: Scaled: (249, 76). Absolute: (499, 326)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['jonitot'/4, l='MpServer', x=-35,65, y=57,62, z=39,33]]
	Chunk stats: MultiplayerChunkCache: 240, 240
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-233,4,71), Chunk: (at 7,0,7 in -15,4; contains blocks -240,0,64 to -225,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 448383 game time, 46175 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 5 total; [vc['Aldeano'/0, l='MpServer', x=-33,50, y=56,00, z=44,50], vc['Aldeano'/1, l='MpServer', x=-33,50, y=56,00, z=40,50], vc['Aldeano'/2, l='MpServer', x=-36,50, y=56,00, z=45,50], vc['Aldeano'/3, l='MpServer', x=-40,50, y=56,00, z=45,50], bgh['jonitot'/4, l='MpServer', x=-35,65, y=57,62, z=39,33]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bgc.a(SourceFile:297)
	at awp.b(SourceFile:1874)
	at awp.e(SourceFile:686)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w38c
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 67096536 bytes (63 MB) / 357068800 bytes (340 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 1 total; -Xmx512M
	AABB Pool Size: 7955 (445480 bytes; 0 MB) allocated, 66 (3696 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w38c
	LWJGL: 2.9.0
	OpenGL: Intel 945G GL version 1.4.0 - Build 8.14.10.1930, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Español (España)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 110 (6160 bytes; 0 MB) allocated, 83 (4648 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-197007/12683037/