[1.47] [SMP] Game Crashes in LAN

I´m currently playing the game on LAN with a few friends. Thing is, when I´m hosting or in SSP I can use a Computer with no trouble, but my friends crash. When they Host, I get a crash when they put a Computer. This is the crash report.

Spoiler

Minecraft has crashed!
———————-

Minecraft has stopped running because it encountered a problem; Unexpected error

A full error report has been saved to C:\Users\Clyde Arrowny\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-20_23.59.13-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(/>



— BEGIN ERROR REPORT 97246bf8 ——–
Full report at:
C:\Users\Clyde Arrowny\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-20_23.59.13-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 20-01-13 11:59 PM

– Head –
Stacktrace:
at ayh.G(WorldClient.java:354)

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [ayk['Clyde'/481, l='MpServer', x=-91,68, y=64,62, z=-15,28], azw['Kairi'/200, l='MpServer', x=-92,75, y=63,50, z=-20,38]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (32,64,252), Chunk: (at 0,4,12 in 2,15; contains blocks 32,0,240 to 47,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 583708 game time, 1848701 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: 61 total; [oy['Chicken'/275, l='MpServer', x=-149,53, y=64,00, z=27,53], pk['Wolf'/1, l='MpServer', x=-159,34, y=69,00, z=48,25], ayk['Clyde'/481, l='MpServer', x=-91,68, y=64,62, z=-15,28], pe['Sheep'/274, l='MpServer', x=-156,56, y=68,00, z=-62,66], oy['Chicken'/2, l='MpServer', x=-150,41, y=67,00, z=59,44], azw['Kairi'/200, l='MpServer', x=-92,75, y=63,50, z=-20,38], pe['Sheep'/273, l='MpServer', x=-157,78, y=64,00, z=-72,91], oy['Chicken'/272, l='MpServer', x=-153,59, y=61,51, z=-95,44], oy['Chicken'/279, l='MpServer', x=-118,84, y=65,00, z=39,59], oy['Chicken'/278, l='MpServer', x=-118,41, y=74,00, z=-93,53], pe['Sheep'/277, l='MpServer', x=-127,78, y=68,00, z=-94,47], ow['Bat'/287, l='MpServer', x=-100,06, y=26,05, z=54,72], px['item.item.dyePowder.black'/326, l='MpServer', x=-37,16, y=56,13, z=-48,91], px['item.item.dyePowder.black'/325, l='MpServer', x=-33,47, y=62,13, z=-49,75], ow['Bat'/20, l='MpServer', x=-124,72, y=42,00, z=62,72], oy['Chicken'/260, l='MpServer', x=-160,84, y=62,00, z=-80,44], oy['Chicken'/261, l='MpServer', x=-162,47, y=72,00, z=-87,53], oy['Chicken'/266, l='MpServer', x=-169,44, y=68,00, z=19,47], ow['Bat'/31, l='MpServer', x=-93,28, y=20,10, z=62,75], px['item.item.dyePowder.black'/335, l='MpServer', x=-29,47, y=61,13, z=-63,47], pk['Wolf'/269, l='MpServer', x=-169,50, y=69,00, z=45,94], px['item.item.dyePowder.black'/334, l='MpServer', x=-30,03, y=61,13, z=-65,44], ow['Bat'/305, l='MpServer', x=-79,25, y=32,10, z=34,25], ow['Bat'/304, l='MpServer', x=-82,38, y=26,52, z=42,56], pe['Sheep'/32, l='MpServer', x=-86,16, y=68,00, z=57,88], pe['Sheep'/306, l='MpServer', x=-84,94, y=68,00, z=42,09], pe['Sheep'/313, l='MpServer', x=-48,53, y=71,00, z=-48,66], pe['Sheep'/315, l='MpServer', x=-49,09, y=67,00, z=-16,09], pe['Sheep'/314, l='MpServer', x=-51,75, y=67,00, z=-16,63], pe['Sheep'/317, l='MpServer', x=-49,25, y=67,00, z=20,50], pe['Sheep'/316, l='MpServer', x=-58,53, y=69,00, z=5,78], ow['Bat'/319, l='MpServer', x=-56,50, y=47,22, z=51,88], ow['Bat'/45, l='MpServer', x=-76,13, y=26,20, z=58,97], pe['Sheep'/318, l='MpServer', x=-56,09, y=67,00, z=25,09], ow['Bat'/291, l='MpServer', x=-86,16, y=21,00, z=-51,47], ow['Bat'/292, l='MpServer', x=-79,22, y=23,90, z=-57,50], pe['Sheep'/293, l='MpServer', x=-89,86, y=64,00, z=13,41], ow['Bat'/294, l='MpServer', x=-87,53, y=25,68, z=40,66], ow['Bat'/295, l='MpServer', x=-84,75, y=40,10, z=36,75], ow['Bat'/296, l='MpServer', x=-80,25, y=39,02, z=39,13], pe['Sheep'/297, l='MpServer', x=-73,09, y=63,00, z=-12,97], ow['Bat'/298, l='MpServer', x=-59,78, y=45,00, z=8,09], pe['Sheep'/299, l='MpServer', x=-69,28, y=64,00, z=10,13], pe['Sheep'/300, l='MpServer', x=-65,13, y=64,00, z=9,78], pe['Sheep'/301, l='MpServer', x=-79,47, y=66,00, z=18,34], pe['Sheep'/302, l='MpServer', x=-72,16, y=68,00, z=28,16], oy['Chicken'/303, l='MpServer', x=-66,53, y=66,00, z=21,53], azw['Kairi'/200, l='MpServer', x=-92,75, y=63,50, z=-20,38], pe['Sheep'/337, l='MpServer', x=-25,16, y=69,00, z=11,06], px['item.item.dyePowder.black'/326, l='MpServer', x=-37,16, y=56,13, z=-48,91], pe['Sheep'/327, l='MpServer', x=-32,50, y=66,00, z=-14,50], ph['Squid'/324, l='MpServer', x=-37,19, y=61,38, z=-56,19], px['item.item.dyePowder.black'/325, l='MpServer', x=-33,47, y=62,13, z=-49,75], px['item.item.dyePowder.black'/334, l='MpServer', x=-30,03, y=61,13, z=-65,44], px['item.item.dyePowder.black'/335, l='MpServer', x=-29,47, y=61,13, z=-63,47], pe['Sheep'/332, l='MpServer', x=-34,91, y=69,00, z=8,09], pe['Sheep'/333, l='MpServer', x=-47,50, y=64,00, z=25,78], ow['Bat'/330, l='MpServer', x=-44,50, y=41,10, z=14,00], pe['Sheep'/331, l='MpServer', x=-44,50, y=69,00, z=7,25], pe['Sheep'/328, l='MpServer', x=-38,50, y=68,00, z=-13,34], pe['Sheep'/329, l='MpServer', x=-43,91, y=68,00, z=-11,94]]
Retry entities: 0 total; []
Stacktrace:
at ayh.a(WorldClient.java:425)
at net.minecraft.client.Minecraft.b(Minecraft.java:2385)
at net.minecraft.client.Minecraft.run(Minecraft.java:806)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.4.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 403054400 bytes (384 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 5798 (324688 bytes; 0 MB) allocated, 717 (40152 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.23 FML v4.5.0.457 Minecraft Forge 6.4.0.394 Optifine OptiFine_1.4.5_HD_U_D8 17 mods loaded, 17 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMinimap [mod_ReiMinimap] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_TooManyItems [mod_TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Core [BuildCraft] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Builders [BC Builders] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Energy [BC Energy] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Factory [BC Factory] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Transport [BC Transport] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ComputerCraft [ComputerCraft] (ComputerCraft1.47.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CCTurtle [ComputerCraft Turtles] (ComputerCraft1.47.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CustomNpcs [CustomNpcs 1.4.5] (CustomNPCs_1.4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.111.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_SmartMoving [Smart Moving] (Smart Moving Client for ModLoader.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_SmartRender [Smart Render] (Smart Moving Client for ModLoader.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: AMD M880G with ATI Mobility Radeon HD 4250 GL version 3.3.10527 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1768 (99008 bytes; 0 MB) allocated, 209 (11704 bytes; 0 MB) used

java.lang.NullPointerException
at ayh.G(WorldClient.java:354)
at net.minecraft.client.Minecraft.l(Minecraft.java:1900)
at net.minecraft.client.Minecraft.J(Minecraft.java:858)
at net.minecraft.client.Minecraft.run(Minecraft.java:783)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT 8108219a ———-

Hope someone can help me.

EDIT: Some additional Info of mods, just in case.

Minecraft Version - 1.4.5
Forge Version - 6.4.0.394
Optifine Version - 1.4.5
Rei Minimap - 3.2_05
Too Many Items - 1.4.5
BuildCraft - 3.2.0
IndustrialCraft 2 - 1.110.137lf
CustomNPC - 0.8
Smart Moving - 11.10

I just tested and it works fine here, so the issue isn't with ComputerCraft. Try updating your forge.