Hopper: java.lang.NullPointerException: Updating screen events

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-2556449/

Crash:

java.lang.NullPointerException: Updating screen events
	at bbp.a(SourceFile:73)
	at bbk.a(SourceFile:50)
	at bce.a(SourceFile:341)
	at bce.k(SourceFile:404)
	at bce.p(SourceFile:381)

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

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 9/4/15 8:32 PM
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
	at bbp.a(SourceFile:73)
	at bbk.a(SourceFile:50)
	at bce.a(SourceFile:341)
	at bce.k(SourceFile:404)
	at bce.p(SourceFile:381)
	at azo.s(SourceFile:1535)
	at azo.as(SourceFile:929)
	at azo.a(SourceFile:378)
	at net.minecraft.client.main.Main.main(SourceFile:125)


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

-- Head --
Stacktrace:
	at bbp.a(SourceFile:73)
	at bbk.a(SourceFile:50)
	at bce.a(SourceFile:341)
	at bce.k(SourceFile:404)
	at bce.p(SourceFile:381)

-- Affected screen --
Details:
	Screen name: bcl
Stacktrace:
	at azo.s(SourceFile:1535)
	at azo.as(SourceFile:929)
	at azo.a(SourceFile:378)
	at net.minecraft.client.main.Main.main(SourceFile:125)

-- System Details --
Details:
	Minecraft Version: 15w36d
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 417688840 bytes (398 MB) / 661745664 bytes (631 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: 1, tcache: 1, allocated: 12, tallocated: 94
	Launched Version: 15w36d
	LWJGL: 2.9.4
	OpenGL: ATI Radeon HD 4350 GL version 2.1.8673, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: Canadian English (Canada)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM)2 Quad CPU Q8300 @ 2.50GHz

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-2556449/74933677/