CRASH

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 7/18/14 4:08 PM
Description: Exception in server tick loop

java.lang.NullPointerException
	at net.minecraft.world.World.getTopSolidOrLiquidBlock(World.java:2009)
	at net.minecraft.world.biome.BiomeDecorator.decorate(BiomeDecorator.java:227)
	at net.minecraft.world.biome.BiomeDecorator.decorate(BiomeDecorator.java:196)
	at net.minecraft.world.biome.BiomeGenBase.decorate(BiomeGenBase.java:371)
	at net.minecraft.world.gen.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:573)
	at net.minecraft.world.gen.ChunkProviderServer.populate(ChunkProviderServer.java:258)
	at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1253)
	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:153)
	at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:294)
	at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:90)
	at net.minecraft.server.integrated.IntegratedServer.startServer(IntegratedServer.java:107)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)
	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Mac OS X (x86_64) version 10.9.3
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 717849592 bytes (684 MB) / 1065025536 bytes (1015 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	FML: MCP v8.11 FML v6.4.45.953 Minecraft Forge 9.11.1.953 4 mods loaded, 4 mods active
	mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
	FML{6.4.45.953} [Forge Mod Loader] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
	Forge{9.11.1.953} [Minecraft Forge] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
	sometimes_hardcore{0.1.2} [sometimes] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'