Hopper: java.lang.UnsupportedOperationException: Unexpected change in protocol to null

java.lang.UnsupportedOperationException: Unexpected change in protocol to null
	at bjk.a(SourceFile:126)
	at ef.a(SourceFile:157)
	at bjj.a(SourceFile:241)
	at bgb.c(SourceFile:108)

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 25.10.13 15:16
Description: Ticking screen

java.lang.UnsupportedOperationException: Unexpected change in protocol to null
	at bjk.a(SourceFile:126)
	at ef.a(SourceFile:157)
	at bjj.a(SourceFile:241)
	at bgb.c(SourceFile:108)
	at azd.o(SourceFile:1318)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at bjk.a(SourceFile:126)
	at ef.a(SourceFile:157)
	at bjj.a(SourceFile:241)
	at bgb.c(SourceFile:108)

-- Affected screen --
Details:
	Screen name: bgb
Stacktrace:
	at azd.o(SourceFile:1318)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 9030736 bytes (8 MB) / 229113856 bytes (218 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	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: 1.7.2
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 5700 Series GL version 4.2.12422 Compatibility Profile Context 13.152.0.0, ATI Technologies Inc.
	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: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)