Random Server Crashing?

[Drakee510]

Ok so now it is happening about twice a day. The server will randomly crash and it is not caused by anything that I know of...

---- Minecraft Crash Report ----
// I just don't know what went wrong :(
 
Time: 12/21/12 6:56 PM
Description: Exception in server tick loop
 
java.lang.NullPointerException
    at id.a(ChunkProviderServer.java:255)
    at ie.a(WorldServer.java:768)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:372)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:591)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:492)
    at fp.run(SourceFile:818)
 
Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows Server 2008 R2 (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: 1882778888 bytes (1795 MB) / 3154444288 bytes (3008 MB) up to 3154444288 bytes (3008 MB)
- JVM Flags: 2 total; -Xmx3072M -Xms3072M
- AABB Pool Size: 12152 (680512 bytes; 0 MB) allocated, 10050 (562800 bytes; 0 MB) used
- FML: ~ERROR~ NullPointerException: null
- Is Modded: Definitely; 'forge,fml'
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 5101 (285656 bytes; 0 MB) allocated, 2486 (139216 bytes; 0 MB) used
- Player Count: 5 / 100; [ih['TripC427'/174, l='world', x=2657.74, y=64.00, z=-825.75], ih['derekvader41'/565, l='world', x=2327.71, y=71.00, z=-3794.30], ih['lildogsac'/22463, l='world', x=1633.65, y=78.00, z=-1766.70], ih['mvdhauten'/38212, l='world', x=2667.01, y=64.00, z=-816.07], ih['tryzzo'/74208, l='world', x=2595.47, y=87.00, z=-790.80]]
- World world Entities: 0 total; []
- World world Players: 0 total; []
- World world Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Dedicated Server

Please Help!