Minecraft crashes with attribute modified tools

Steps to reproduce:
1. Use Sethbling's add attribute filter in MCEdit
2. Hover over the tool with your mouse
3. This happens...

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 20/07/13 10:01 PM
Description: Ticking player

java.lang.IllegalArgumentException: Modifier name cannot be empty
	at org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)
	at os.<init>(SourceFile:31)
	at to.a(SourceFile:94)
	at yd.D(SourceFile:580)
	at oe.l_(SourceFile:1170)
	at ue.l_(SourceFile:203)
	at ju.h(SourceFile:180)
	at jz.a(SourceFile:190)
	at et.a(SourceFile:136)
	at cm.b(SourceFile:64)
	at jz.e(SourceFile:60)
	at kc.b(SourceFile:37)
	at bkz.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)


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 os.<init>(SourceFile:31)
	at to.a(SourceFile:94)
	at yd.D(SourceFile:580)
	at oe.l_(SourceFile:1170)
	at ue.l_(SourceFile:203)

-- Player being ticked --
Details:
	Entity Type: null (ju)
	Entity ID: 1125820
	Entity Name: Jragon14
	Entity's Exact location: 341.05, 56.00, 1462.58
	Entity's Block location: World: (341,56,1462), Chunk: (at 5,3,6 in 21,91; contains blocks 336,0,1456 to 351,255,1471), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
	Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
	at ju.h(SourceFile:180)
	at jz.a(SourceFile:190)
	at et.a(SourceFile:136)
	at cm.b(SourceFile:64)
	at jz.e(SourceFile:60)

-- Ticking connection --
Details:
	Connection: jz@a82d8e
Stacktrace:
	at kc.b(SourceFile:37)
	at bkz.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	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: 182131520 bytes (173 MB) / 316821504 bytes (302 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 332 (18592 bytes; 0 MB) allocated, 321 (17976 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 13 (728 bytes; 0 MB) allocated, 13 (728 bytes; 0 MB) used
	Player Count: 1 / 8; [ju['Jragon14'/1125820, l='Computers', x=341.05, y=56.00, z=1462.58]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.