every time a banner is on my screen Minecraft crashes i have the report

---- Minecraft Crash Report ----
// Oops.

Time: 7/25/14 4:31 PM
Description: Registering texture

java.lang.IllegalArgumentException: Unknown image type 0
at java.awt.image.BufferedImage.<init>(Unknown Source)
at csa.a(SourceFile:40)
at csn.a(SourceFile:56)
at clu.a(SourceFile:122)
at clu.a(SourceFile:70)
at clu.a(SourceFile:22)
at cly.a(SourceFile:114)
at cly.a(SourceFile:107)
at chp.a(SourceFile:32)
at cop.a(SourceFile:98)
at cop.a(SourceFile:334)
at cop.b(SourceFile:368)
at bxd.a(SourceFile:249)
at bxd.a(SourceFile:107)
at bxv.a(SourceFile:36)
at bxr.a(SourceFile:548)
at cht.b(SourceFile:1007)
at brp.ar(SourceFile:896)
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.awt.image.BufferedImage.<init>(Unknown Source)
at csa.a(SourceFile:40)

– Resource location being registered –
Details:
Resource location: minecraft:b15
Texture object class: csa
Stacktrace:
at csn.a(SourceFile:56)
at clu.a(SourceFile:122)
at clu.a(SourceFile:70)
at clu.a(SourceFile:22)

– Block Entity Details –
Details:
Name: Banner // bbf
Stacktrace:
at cly.a(SourceFile:114)
at cly.a(SourceFile:107)
at chp.a(SourceFile:32)
at cop.a(SourceFile:98)
at cop.a(SourceFile:334)

– Item being rendered –
Details:
Item Type: ajb@9d04dc
Item Aux: 15
Item NBT: null
Item Foil: false
Stacktrace:
at cop.b(SourceFile:368)
at bxd.a(SourceFile:249)
at bxd.a(SourceFile:107)
at bxv.a(SourceFile:36)
at bxr.a(SourceFile:548)

– Screen render details –
Details:
Screen name: bxr
Mouse location: Scaled: (424, 207). Absolute: (849, 290)
Screen size: Scaled: (683, 353). Absolute: (1366, 706). Scale factor of 2

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cha['Bloody_Griffian'/32, l='MpServer', x=731.59, y=4.00, z=723.38]]
Chunk stats: MultiplayerChunkCache: 35, 35
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 710.00,4.00,733.00 - World: (710,4,733), Chunk: (at 6,0,13 in 44,45; contains blocks 704,0,720 to 719,255,735), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
Level time: 3688 game time, 3688 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: 1 total; [cha['Bloody_Griffian'/32, l='MpServer', x=731.59, y=4.00, z=723.38]]
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: Windows 7 (x86) version 6.1
Java Version: 1.6.0_17, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 408490432 bytes (389 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 14w30c
LWJGL: 2.9.1
OpenGL: Mobile Intel(R) 4 Series Express Chipset Family GL version 2.1.0 - Build 8.15.10.2086, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objec