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

java.lang.UnsupportedOperationException: Unexpected change in protocol to null
	at bir.a(SourceFile:130)
	at ek.a(SourceFile:139)
	at biq.a(SourceFile:245)
	at bfj.c(SourceFile:108)

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 10/11/13 8:14 PM
Description: Ticking screen

java.lang.UnsupportedOperationException: Unexpected change in protocol to null
	at bir.a(SourceFile:130)
	at ek.a(SourceFile:139)
	at biq.a(SourceFile:245)
	at bfj.c(SourceFile:108)
	at ayp.o(SourceFile:1318)
	at ayp.ab(SourceFile:755)
	at ayp.e(SourceFile:706)
	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 bir.a(SourceFile:130)
	at ek.a(SourceFile:139)
	at biq.a(SourceFile:245)
	at bfj.c(SourceFile:108)

-- Affected screen --
Details:
	Screen name: bfj
Stacktrace:
	at ayp.o(SourceFile:1318)
	at ayp.ab(SourceFile:755)
	at ayp.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 118561896 bytes (113 MB) / 218853376 bytes (208 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w41b
	LWJGL: 2.9.0
	OpenGL: NVIDIA GeForce 9400M OpenGL Engine GL version 2.1 NVIDIA-1.6.36, NVIDIA Corporation
	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)