Minecraft error "Rendering item java.lang.NullPointerException: Rendering item".

alguien me trataria de solucionar este problema que tengo, el problema surgio al yo entrar a un servidor que de objetivo trata de defender a los aldeanos, el problena inicia cuando entro a la sala y me sale este error:

---- Minecraft Crash Report ----
// Don’t be sad. I’ll do better next time, I promise!

Time: 14/11/13 19:07
Description: Rendering item

java.lang.NullPointerException: Rendering item
at abp.c(SourceFile:99)
at bnq.a(SourceFile:281)
at bnq.b(SourceFile:379)
at bdd.a(SourceFile:240)
at bdd.a(SourceFile:105)
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 abp.c(SourceFile:99)
at bnq.a(SourceFile:281)

– Item being rendered –
Details:
Item Type: null
Item Aux: 0
Item NBT: {display:{Name:"§r§cWarlock Kit",Lore:[0:"§7Diamonds: Free",1:"§75 slowness, strength, and speed potions.",],},}
Item Foil: ERROR NullPointerException: null
Stacktrace:
at bnq.b(SourceFile:379)
at bdd.a(SourceFile:240)
at bdd.a(SourceFile:105)

– Screen render details –
Details:
Screen name: bdo
Mouse location: Scaled: (213, 119). Absolute: (427, 240)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

– Affected level –
Details:
Level name: MpServer
All players: 11 total; [bje[‘Canorgp’/815702, l=‘MpServer’, x=0,00, y=143,54, z=0,00], bld[‘FoY_ARG’/821203, l=‘MpServer’, x=0,00, y=140,00, z=0,00], bld[‘charlierobe1’/820116, l=‘MpServer’, x=9,33, y=140,43, z=10,75], bld[‘IvanBoni836’/821195, l=‘MpServer’, x=0,00, y=140,00, z=0,00], bld[‘123abc4273’/814262, l=‘MpServer’, x=-15,45, y=140,00, z=3,58], bld[‘sanmiguel33’/815097, l=‘MpServer’, x=-13,28, y=143,00, z=8,74], bld[‘ricke354’/817389, l=‘MpServer’, x=-0,31, y=139,94, z=0,25], bld[‘sasuke1098’/816135, l=‘MpServer’, x=-1,16, y=140,00, z=2,19], bld[‘x_laucha_x’/815350, l=‘MpServer’, x=-10,59, y=141,84, z=10,22], bld[‘tootheking’/803564, l=‘MpServer’, x=-2,32, y=140,00, z=-1,92], bld[‘IIIKILLAIII’/814630, l=‘MpServer’, x=-9,36, y=140,00, z=-7,84]]
Chunk stats: MultiplayerChunkCache: 75, 75
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,65,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 5622250 game time, 49808 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: 21 total; [bld[‘FoY_ARG’/821203, l=‘MpServer’, x=0,00, y=140,00, z=0,00], bld[‘sasuke1098’/816135, l=‘MpServer’, x=-1,16, y=140,00, z=2,19], bld[‘tootheking’/803564, l=‘MpServer’, x=-2,32, y=140,00, z=-1,92], bld[‘charlierobe1’/820116, l=‘MpServer’, x=9,33, y=140,43, z=10,75], bld[‘123abc4273’/814262, l=‘MpServer’, x=-15,45, y=140,00, z=3,58], bld[‘x_laucha_x’/815350, l=‘MpServer’, x=-10,59, y=141,84, z=10,22], bld[‘sasuke1098’/816135, l=‘MpServer’, x=-1,16, y=140,00, z=2,19], bld[‘IIIKILLAIII’/814630, l=‘MpServer’, x=-9,36, y=140,00, z=-7,84], bld[‘x_laucha_x’/815350, l=‘MpServer’, x=-10,59, y=141,84, z=10,22], bld[‘sanmiguel33’/815097, l=‘MpServer’, x=-13,28, y=143,00, z=8,74], bld[‘IIIKILLAIII’/814630, l=‘MpServer’, x=-9,36, y=140,00, z=-7,84], bld[‘tootheking’/803564, l=‘MpServer’, x=-2,32, y=140,00, z=-1,92], bld[‘123abc4273’/814262, l=‘MpServer’, x=-15,45, y=140,00, z=3,58], bld[‘IvanBoni836’/821195, l=‘MpServer’, x=0,00, y=140,00, z=0,00], bld[‘ricke354’/817389, l=‘MpServer’, x=-0,31, y=139,94, z=0,25], bld[‘sanmiguel33’/815097, l=‘MpServer’, x=-13,28, y=143,00, z=8,74], bld[‘ricke354’/817389, l=‘MpServer’, x=-0,31, y=139,94, z=0,25], bje[‘Canorgp’/815702, l=‘MpServer’, x=0,00, y=143,54, z=0,00], bld[‘charlierobe1’/820116, l=‘MpServer’, x=9,33, y=140,43, z=10,75], bld[‘FoY_ARG’/821203, l=‘MpServer’, x=0,00, y=140,00, z=0,00], bld[‘IvanBoni836’/821195, l=‘MpServer’, x=0,00, y=140,00, z=0,00]]
Retry entities: 0 total;
Server brand: craftbukkit
Server type: Non-integrated multiplayer 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_45, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 41194288 bytes (39 MB) / 100663296 bytes (96 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 2195 (122920 bytes; 0 MB) allocated, 1265 (70840 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.7.2
LWJGL: 2.9.0
OpenGL: GeForce 6200/PCI/SSE2 GL version 2.1.2, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: Español (España)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 91 (5096 bytes; 0 MB) allocated, 91 (5096 bytes; 0 MB) used
Anisotropic Filtering: Off (1)