Hopper: java.lang.ArrayIndexOutOfBoundsException: -1

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.fastRemove(ArrayList.java:441)
	at java.util.ArrayList.remove(ArrayList.java:424)
	at qj.b(SourceFile:65)
	at qi.c(SourceFile:326)
	at sf.e(SourceFile:300)
	at cwp.t(SourceFile:311)
	at brp.a(SourceFile:1942)
	at brp.a(SourceFile:1930)
	at bvq.a(SourceFile:46)
	at bvx.a(SourceFile:342)
	at bvx.k(SourceFile:405)
	at bvx.p(SourceFile:382)

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 7/24/14 11:26 AM
Description: Updating screen events

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.fastRemove(ArrayList.java:441)
	at java.util.ArrayList.remove(ArrayList.java:424)
	at qj.b(SourceFile:65)
	at qi.c(SourceFile:326)
	at sf.e(SourceFile:300)
	at cwp.t(SourceFile:311)
	at brp.a(SourceFile:1942)
	at brp.a(SourceFile:1930)
	at bvq.a(SourceFile:46)
	at bvx.a(SourceFile:342)
	at bvx.k(SourceFile:405)
	at bvx.p(SourceFile:382)
	at brp.r(SourceFile:1476)
	at brp.ar(SourceFile:871)
	at brp.a(SourceFile:311)
	at net.minecraft.client.main.Main.main(SourceFile:120)


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

-- Head --
Stacktrace:
	at java.util.ArrayList.fastRemove(ArrayList.java:441)
	at java.util.ArrayList.remove(ArrayList.java:424)
	at qj.b(SourceFile:65)
	at qi.c(SourceFile:326)
	at sf.e(SourceFile:300)
	at cwp.t(SourceFile:311)
	at brp.a(SourceFile:1942)
	at brp.a(SourceFile:1930)
	at bvq.a(SourceFile:46)
	at bvx.a(SourceFile:342)
	at bvx.k(SourceFile:405)
	at bvx.p(SourceFile:382)

-- Affected screen --
Details:
	Screen name: bvq

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [cha['eagercheesecake'/155263, l='MpServer', x=10.38, y=60.22, z=-1417.36]]
	Chunk stats: MultiplayerChunkCache: 1089, 1089
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 22.00,4.00,-1409.00 - World: (22,4,-1409), Chunk: (at 6,0,15 in 1,-89; contains blocks 16,0,-1424 to 31,255,-1409), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
	Level time: 268872 game time, 15000 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: 2 total; [cha['eagercheesecake'/155263, l='MpServer', x=-3.61, y=61.00, z=-1419.47], cha['eagercheesecake'/155263, l='MpServer', x=10.38, y=60.22, z=-1417.36]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at ccz.a(SourceFile:308)
	at brp.b(SourceFile:2254)
	at brp.a(SourceFile:320)
	at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
	Minecraft Version: 14w30c
	Operating System: Mac OS X (x86_64) version 10.9.4
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 27927288 bytes (26 MB) / 1065025536 bytes (1015 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w30c
	LWJGL: 2.9.1
	OpenGL: Intel HD Graphics 5000 OpenGL Engine GL version 2.1 INTEL-8.28.30, Intel 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: English (US)
	Profiler Position: N/A (disabled)