Hopper: java.lang.IllegalArgumentException: Modifier name cannot be empty

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-469411/

Crash:

java.lang.IllegalArgumentException: Modifier name cannot be empty
	at org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)
	at rv.<init>(SourceFile:29)
	at wv.a(SourceFile:94)
	at abp.D(SourceFile:594)
	at abp.a(SourceFile:482)
	at bcd.a(SourceFile:76)
	at bdr.a(SourceFile:582)
	at bdd.a(SourceFile:166)
	at bdu.a(SourceFile:30)
	at bdr.a(SourceFile:531)

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: 10/26/13 11:35 PM
Description: Rendering screen

java.lang.IllegalArgumentException: Modifier name cannot be empty
	at org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)
	at rv.<init>(SourceFile:29)
	at wv.a(SourceFile:94)
	at abp.D(SourceFile:594)
	at abp.a(SourceFile:482)
	at bcd.a(SourceFile:76)
	at bdr.a(SourceFile:582)
	at bdd.a(SourceFile:166)
	at bdu.a(SourceFile:30)
	at bdr.a(SourceFile:531)
	at bll.b(SourceFile:851)
	at azd.ad(SourceFile:780)
	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 org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)
	at rv.<init>(SourceFile:29)
	at wv.a(SourceFile:94)
	at abp.D(SourceFile:594)
	at abp.a(SourceFile:482)
	at bcd.a(SourceFile:76)
	at bdr.a(SourceFile:582)
	at bdd.a(SourceFile:166)
	at bdu.a(SourceFile:30)
	at bdr.a(SourceFile:531)

-- Screen render details --
Details:
	Screen name: bdr
	Mouse location: Scaled: (253, 192). Absolute: (1015, 291)
	Screen size: Scaled: (480, 265). Absolute: (1920, 1058). Scale factor of 4

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bje['TheWetOnion'/77, l='MpServer', x=546.60, y=5.62, z=-443.26]]
	Chunk stats: MultiplayerChunkCache: 255, 255
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (633,4,-474), Chunk: (at 9,0,6 in 39,-30; contains blocks 624,0,-480 to 639,255,-465), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
	Level time: 1860229 game time, 88696 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: 12 total; [ut['Cow'/34, l='MpServer', x=608.09, y=4.00, z=-519.97], vb['Sheep'/0, l='MpServer', x=509.59, y=4.00, z=-405.22], vb['Sheep'/1, l='MpServer', x=504.03, y=4.00, z=-397.59], vb['Sheep'/2, l='MpServer', x=510.53, y=4.00, z=-399.53], vb['Sheep'/33, l='MpServer', x=605.81, y=4.00, z=-466.38], vb['Sheep'/6, l='MpServer', x=516.09, y=4.00, z=-397.06], bje['TheWetOnion'/77, l='MpServer', x=546.60, y=5.62, z=-443.26], va['Pig'/10, l='MpServer', x=543.75, y=4.00, z=-505.81], ut['Cow'/11, l='MpServer', x=544.97, y=4.00, z=-479.94], ut['Cow'/13, l='MpServer', x=536.13, y=4.00, z=-390.84], ut['Cow'/15, l='MpServer', x=544.75, y=4.00, z=-497.25], ut['Cow'/19, l='MpServer', x=544.72, y=4.00, z=-381.78]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:713)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 22972256 bytes (21 MB) / 125939712 bytes (120 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 423 (23688 bytes; 0 MB) allocated, 5 (280 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2372, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [[1.7 - 13w41a]MiniDoku_TSC_Light.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 111 (6216 bytes; 0 MB) allocated, 27 (1512 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-469411/22187251/