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Alright, everything was running smoothly, mods work, the server works. I get down into a mineshaft and kill a skele, it crashes on me, and gives me this.
---- Minecraft Crash Report ----
// You're mean.

Time: 12/11/12 9:03 AM
Description: Ticking entity

java.lang.NullPointerException
at um.a(SourceFile:283)
at qw.j(SourceFile:192)
at qx.c(EntityPlayer.java:511)
at azv.c(SourceFile:197)
at md.j_(EntityLiving.java:778)
at qx.j_(EntityPlayer.java:281)
at ayk.j_(SourceFile:45)
at xv.a(World.java:2258)
at xv.g(World.java:2221)
at xv.h(World.java:2068)
at net.minecraft.client.Minecraft.l(Minecraft.java:1867)
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)


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

-- Head --
Stacktrace:
at um.a(SourceFile:283)
at qw.j(SourceFile:192)
at qx.c(EntityPlayer.java:511)
at azv.c(SourceFile:197)
at md.j_(EntityLiving.java:778)
at qx.j_(EntityPlayer.java:281)
at ayk.j_(SourceFile:45)
at xv.a(World.java:2258)
at xv.g(World.java:2221)

-- Entity being ticked --
Details:
Entity Type: null (ayk)
Entity ID: 7579
Name: cloud_strife18
Exact location: -193.78, 65.62, 248.44
Block location: World: (-194,65,248), Chunk: (at 14,4,8 in -13,15; contains blocks -208,0,240 to -193,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Momentum: 0.00, 0.00, 0.00
Stacktrace:
at xv.h(World.java:2068)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ayk['cloud_strife18'/7579, l='MpServer', x=-193.78, y=65.62, z=248.44]]
Chunk stats: MultiplayerChunkCache: 15
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-256,64,72), Chunk: (at 0,4,8 in -16,4; contains blocks -256,0,64 to -241,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 668883 game time, 680272 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: 23 total; [lz['Experience Orb'/7584, l='MpServer', x=-6200.00, y=2096.00, z=7945.00], ayk['cloud_strife18'/7579, l='MpServer', x=-193.78, y=65.62, z=248.44], qz['arrow'/7585, l='MpServer', x=-196.75, y=64.03, z=247.44], qz['arrow'/7586, l='MpServer', x=-196.63, y=64.03, z=247.56], qz['arrow'/7587, l='MpServer', x=-196.41, y=64.03, z=247.47], qz['arrow'/7588, l='MpServer', x=-196.84, y=64.03, z=247.56], qz['arrow'/7589, l='MpServer', x=-196.34, y=64.03, z=247.47], qz['arrow'/7590, l='MpServer', x=-196.78, y=64.03, z=247.50], qn['Skeleton'/7651, l='MpServer', x=-207.16, y=62.31, z=269.34], qz['arrow'/7591, l='MpServer', x=-196.59, y=64.03, z=247.59], qz['arrow'/7592, l='MpServer', x=-196.84, y=64.03, z=247.56], qz['arrow'/7662, l='MpServer', x=-185.88, y=63.00, z=234.25], qz['arrow'/7663, l='MpServer', x=-184.44, y=63.00, z=237.50], px['item.item.bone'/7581, l='MpServer', x=-195.53, y=64.13, z=250.97], px['item.item.slimeball'/7664, l='MpServer', x=-184.84, y=52.13, z=228.78], px['item.item.slimeball'/7664, l='MpServer', x=-184.84, y=52.13, z=228.78], lz['Experience Orb'/7583, l='MpServer', x=-6202.00, y=2079.00, z=7954.00], qn['Skeleton'/7642, l='MpServer', x=-216.94, y=42.00, z=257.31], lz['Experience Orb'/7582, l='MpServer', x=-6201.00, y=2106.00, z=7947.00], qn['Skeleton'/7641, l='MpServer', x=-213.50, y=43.00, z=269.06], px['item.item.bone'/7581, l='MpServer', x=-195.53, y=64.13, z=250.97], qn['Skeleton'/7640, l='MpServer', x=-211.91, y=63.00, z=249.50], qn['Skeleton'/7580, l='MpServer', x=-196.34, y=64.00, z=247.63]]
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:799)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 581294448 bytes (554 MB) / 648740864 bytes (618 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 9268 (519008 bytes; 0 MB) allocated, 6 (336 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 v4.5.17.479 Minecraft Forge 6.4.1.426 22 mods loaded, 22 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
BuildCraft|Core [BuildCraft] (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
APUnofficial [Additional Pipes Unofficial] (AdditionalPipes-2.1.3u28b2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Backpack [Backpack] (backpack-1.5.4-1.4.4.zip) 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
ValvePipe [Valve Pipe] (Buildcraft-Z-ValvePipe_MC1.4.5_Mod1.3.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
craftguide [CraftGuide] (CraftGuide-1.6.5.11.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FinderCompass [Finder Compass] (FinderCompass_1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.109.113-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
StevesCarts [Steve's Carts] (StevesCarts2.0.0.a35.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion [Thermal Expansion] (ThermalExpansion-2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion|Factory [Factory] (ThermalExpansion-2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion|Energy [Energy] (ThermalExpansion-2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion|NEI [NEI] (ThermalExpansion-2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ThermalExpansion|Transport [Transport] (ThermalExpansion-2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
AS_UpdateCheck [AtomicStryker Update Check Mod] (UpdateCheckerMod_1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: GeForce GTX 650 Ti/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
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: 47 (2632 bytes; 0 MB) allocated, 21 (1176 bytes; 0 MB) used

Then, I finally got to sign into the server, and didn't go back down into the same mine, and went on the surface, managed to kill another skeleton and wham, it happened again......:\ Any idea's on how to fix this?

Description: Ticking entity
Ticking is the opposite of rendering, so if rendering is creating, ticking is destroying, so it had a problem with that skeleton being killed, so you pretty much tick it. It had a problem making the carbon particles (smoke) when a mob gets killed. Try using minimal particles for now, until someone else can figure out how to fix this, all I know is that minimal particles won't activate cloud_strife18, which is the clouds when a mob gets killed.

That does make much sense. I will set the particals to low, and keep an update if it crashes again. It was rather annoying to say the least, thank you!