Crash when i break monitor

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

Time: 22/07/14 21.24
Description: Unexpected error

java.lang.NullPointerException
at net.minecraft.tileentity.TileEntity.func_85027_a(TileEntity.java:283)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76949_a(SourceFile:111)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76950_a(SourceFile:98)
at net.minecraft.client.renderer.RenderGlobal.func_72713_a(RenderGlobal.java:597)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1509)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1123)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


A detailed walkthrough of the error, its code path and all known details is as follows:
—————————————————————————————

– Head –
Stacktrace:
at net.minecraft.tileentity.TileEntity.func_85027_a(TileEntity.java:283)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76949_a(SourceFile:111)
at net.minecraft.client.renderer.tileentity.TileEntityRenderer.func_76950_a(SourceFile:98)
at net.minecraft.client.renderer.RenderGlobal.func_72713_a(RenderGlobal.java:597)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1509)

– Affected level –
Details:
Level name: MpServer
All players: 3 total; [EntityClientPlayerMP['_Ale2610_'/126243, l='MpServer', x=68,07, y=65,62, z=278,61], EntityOtherPlayerMP['valithor2'/121860, l='MpServer', x=46,53, y=92,56, z=264,16], EntityOtherPlayerMP['Abelatox'/125057, l='MpServer', x=78,13, y=73,16, z=249,53]]
Chunk stats: MultiplayerChunkCache: 420
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (33,66,277), Chunk: (at 1,4,5 in 2,17; contains blocks 32,0,272 to 47,255,287), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 37399043 game time, 40698252 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 21 total; [EntityOtherPlayerMP['Abelatox'/125057, l='MpServer', x=78,13, y=73,16, z=249,53], EntityZombie['Zombie'/126211, l='MpServer', x=60,88, y=64,00, z=302,63], EntityClientPlayerMP['_Ale2610_'/126243, l='MpServer', x=68,07, y=65,62, z=278,61], EntityOtherPlayerMP['valithor2'/121860, l='MpServer', x=46,53, y=92,56, z=264,16], EntityWaypointContainer['unknown'/11, l='MpServer', x=0,00, y=0,00, z=0,00], EntityEnderman['Enderman'/124887, l='MpServer', x=40,72, y=81,00, z=242,72], EntityZombie['Zombie'/126241, l='MpServer', x=42,16, y=71,00, z=315,28], EntitySkeleton['Skeleton'/125537, l='MpServer', x=87,50, y=41,00, z=230,50], EntityZombie['Zombie'/126117, l='MpServer', x=66,97, y=56,00, z=237,84], EntityZombie['Zombie'/126119, l='MpServer', x=67,60, y=56,00, z=239,87], EntityZombie['Zombie'/126118, l='MpServer', x=66,05, y=56,00, z=237,40], EntitySkeleton['Skeleton'/126120, l='MpServer', x=57,31, y=56,00, z=250,25], EntitySpider['Spider'/126189, l='MpServer', x=107,56, y=18,00, z=268,28], EntityBat['Bat'/125043, l='MpServer', x=77,41, y=62,10, z=252,41], EntityOtherPlayerMP['valithor2'/121860, l='MpServer', x=46,53, y=92,56, z=264,16], EntityBat['Bat'/125044, l='MpServer', x=64,44, y=62,10, z=262,16], EntityBat['Bat'/125046, l='MpServer', x=64,38, y=62,10, z=243,41], EntityOtherPlayerMP['GVRogers'/125101, l='MpServer', x=49,75, y=65,01, z=244,89], EntityBat['Bat'/125048, l='MpServer', x=70,53, y=62,10, z=245,47], EntityOtherPlayerMP['Abelatox'/125057, l='MpServer', x=78,13, y=73,16, z=249,53], EntitySpider['Spider'/124924, l='MpServer', x=68,75, y=56,00, z=239,84]]
Retry entities: 0 total; []
Server brand: mcpc,cauldron,craftbukkit,fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2312)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:863)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

– System Details –
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 513650688 bytes (489 MB) / 1021313024 bytes (974 MB) up to 1021313024 bytes (974 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -Xmx1g -Xms1g
AABB Pool Size: 2762 (154672 bytes; 0 MB) allocated, 437 (24472 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 6, tallocated: 62
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_U_C8 50 mods loaded, 50 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AppliedEnergistics-Core{rv14.finale3} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems 1.6.1.9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenModsCore{@VERSION@} [OpenModsCore] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AppliedEnergistics{rv14.finale3} [Applied Energistics] (appeng-rv14-finale3-mc16x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Core{4.2.2} [BuildCraft] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Builders{4.2.2} [BC Builders] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Energy{4.2.2} [BC Energy] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Factory{4.2.2} [BC Factory] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Transport{4.2.2} [BC Transport] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Silicon{4.2.2} [BC Silicon] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ChickenChunks{1.3.3.4} [ChickenChunks] (ChickenChunks-1.6.4-1.3.3.4-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHCore{2.0.0.5} [CoFH Core] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHLoot{2.0.0.5} [CoFH Loot] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHMasquerade{2.0.0.5} [CoFH Masquerade] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHSocial{2.0.0.5} [CoFH Social] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CoFHWorld{2.0.0.5} [CoFH World] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ImmibisCore{57.2.0} [Immibis Core] (immibis-core-57.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
DimensionalAnchors{57.1.96} [Dimensional Anchors] (dimensional-anchor-57.1.96.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
EnderStorage{1.4.3.6} [EnderStorage] (EnderStorage 1.4.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ImmibisPeripherals{57.1.0} [Immibis's Peripherals] (immibis-peripherals-57.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
inventorytweaks{1.56} [Inventory Tweaks] (invtweaks.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
IronChest{5.4.1.702} [Iron Chest] (ironchest-universal-1.6.4-5.4.1.702.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MCCapesExtra{1.6.4a} [MCCapes Extra] (mcapes.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
moarperipherals{0.2} [MoarPeripherals] (MoarPeripherals-1.6.4-1.63-1.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Morph{0.7.1} [Morph] (Morph-Beta-0.7.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenMods{0.5.1} [OpenMods] (OpenModsLib-0.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ForgeMultipart{1.0.0.244} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Core{4.3.5.30} [ProjectRed] (ProjectRedBase-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Transmission{4.3.5.30} [ProjectRed-Transmission] (ProjectRedIntegration-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
SGCraft{0.7.3} [SG Craft] (SGCraft-0.7.3-mc1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion{3.0.0.7} [Thermal Expansion] (ThermalExpansion-3.0.0.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenPeripheralCore{0.4.1} [OpenPeripheralCore] (OpenPeripheralCore-0.4.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenPeripheral{0.1.5} [OpenPeripheralAddons] (OpenPeripheralAddons-0.1.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenBlocks{1.2.9} [OpenBlocks] (OpenBlocks-1.2.9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenComputers|Core{1.0.0} [OpenComputers (Core)] (OpenComputers-MC1.6.4-1.2.13.379-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
OpenComputers{1.2.13.379} [OpenComputers] (OpenComputers-MC1.6.4-1.2.13.379-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Transportation{4.3.5.30} [ProjectRed-Transportation] (ProjectRedMechanical-BETA-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Exploration{4.3.5.30} [ProjectRed-Exploration] (ProjectRedWorld-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Compatibility{4.3.5.30} [ProjectRed-Compatibility] (ProjectRedCompat-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Integration{4.3.5.30} [ProjectRed-Integration] (ProjectRedIntegration-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Illumination{4.3.5.30} [ProjectRed-Illumination] (ProjectRedLighting-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ProjRed|Expansion{4.3.5.30} [ProjectRed-Expansion] (ProjectRedMechanical-BETA-1.6.4-4.3.5.30.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
McMultipart{1.0.0.244} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ForgeMicroblock{1.0.0.244} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: GeForce 9200/integrated/SSE2 GL version 3.3.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1900 (106400 bytes; 0 MB) allocated, 68 (3808 bytes; 0 MB) used

It'd be helpful if you could post more information about the crash.

I see(based on the crashlog) that you are using ComputerCraft 1.63, and the most up to date forge version for MC 1.6.4. However, some reproduction steps would be helpful, rather than just the log.
Does this happen every time? How do you reproduce the error? It's all in the details.

Optifine is notorious for triggering these sorts of issues. Please also test without it.