Hopper: java.lang.IllegalArgumentException: MALFORMED

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-315958/

Crash:

java.lang.IllegalArgumentException: MALFORMED
	at java.util.zip.ZipCoder.toString(Unknown Source)
	at java.util.zip.ZipFile.getZipEntry(Unknown Source)
	at java.util.zip.ZipFile.access$900(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at bpr.c(SourceFile:69)
	at bqg.a(SourceFile:34)
	at bqg.a(SourceFile:89)
	at ayp.b(SourceFile:490)
	at bfp.a(SourceFile:151)
	at bbp.a(SourceFile:172)
	at bfp.a(SourceFile:158)
	at bbp.d(SourceFile:236)
	at bbp.k(SourceFile:211)

The following is the first clean report made public about this crash:

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

Time: 11-10-2013 20:59
Description: Updating screen events

java.lang.IllegalArgumentException: MALFORMED
	at java.util.zip.ZipCoder.toString(Unknown Source)
	at java.util.zip.ZipFile.getZipEntry(Unknown Source)
	at java.util.zip.ZipFile.access$900(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at bpr.c(SourceFile:69)
	at bqg.a(SourceFile:34)
	at bqg.a(SourceFile:89)
	at ayp.b(SourceFile:490)
	at bfp.a(SourceFile:151)
	at bbp.a(SourceFile:172)
	at bfp.a(SourceFile:158)
	at bbp.d(SourceFile:236)
	at bbp.k(SourceFile:211)
	at ayp.o(SourceFile:1303)
	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 java.util.zip.ZipCoder.toString(Unknown Source)
	at java.util.zip.ZipFile.getZipEntry(Unknown Source)
	at java.util.zip.ZipFile.access$900(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at java.util.zip.ZipFile$1.nextElement(Unknown Source)
	at bpr.c(SourceFile:69)
	at bqg.a(SourceFile:34)
	at bqg.a(SourceFile:89)
	at ayp.b(SourceFile:490)
	at bfp.a(SourceFile:151)
	at bbp.a(SourceFile:172)
	at bfp.a(SourceFile:158)
	at bbp.d(SourceFile:236)
	at bbp.k(SourceFile:211)

-- Affected screen --
Details:
	Screen name: bfp
Stacktrace:
	at ayp.o(SourceFile:1303)
	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: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 42972608 bytes (40 MB) / 112779264 bytes (107 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	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: 13w41b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6320 Graphics   GL version 4.1.10993 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [CellPack 0.2.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-315958/16915678/