Hopper: java.lang.NullPointerException: Ticking screen

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-1427898/

Crash:

java.lang.NullPointerException: Ticking screen
	at ek.a(SourceFile:266)
	at eg.h(SourceFile:148)
	at eg.a(SourceFile:154)
	at bbp.c(SourceFile:78)

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

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 26/02/14 10:05
Description: Ticking screen

java.lang.NullPointerException: Ticking screen
	at ek.a(SourceFile:266)
	at eg.h(SourceFile:148)
	at eg.a(SourceFile:154)
	at bbp.c(SourceFile:78)
	at azl.p(SourceFile:1318)
	at azl.ah(SourceFile:757)
	at azl.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:148)


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

-- Head --
Stacktrace:
	at ek.a(SourceFile:266)
	at eg.h(SourceFile:148)
	at eg.a(SourceFile:154)
	at bbp.c(SourceFile:78)

-- Affected screen --
Details:
	Screen name: bbp
Stacktrace:
	at azl.p(SourceFile:1318)
	at azl.ah(SourceFile:757)
	at azl.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
	Minecraft Version: 1.7.5
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 103413064 bytes (98 MB) / 165982208 bytes (158 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.5
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 4600 GL version 4.2.0 - Build 10.18.10.3379, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-1427898/66945460/