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So I was just playing Minecraft, doing a little exploring, and all of a sudden it just closed itself, and the launcher opened and looked normal. When I tried to start Minecraft again, it crashed. Could someone please help me figure out why its suddenly crashing?

Here is the crash report:

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 28/10/13 7:02 PM
Description: Exception in server tick loop

java.lang.NullPointerException
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:47)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:81)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:533)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:258)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1253)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:153)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:43)
at net.minecraft.server.management.PlayerManager.func_72690_a(SourceFile:208)
at net.minecraft.server.management.PlayerManager.func_72683_a(SourceFile:240)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:220)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:268)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:136)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 59737272 bytes (56 MB) / 299847680 bytes (285 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 39 (2184 bytes; 0 MB) allocated, 39 (2184 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 v6.4.21.917 Minecraft Forge 9.11.1.917 8 mods loaded, 8 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.21.917} [Forge Mod Loader] (minecraftforge-9.11.1.917.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.917} [Minecraft Forge] (minecraftforge-9.11.1.917.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.6} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.5} [Not Enough Items] (NotEnoughItems 1.6.1.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
jammyfurniture{4.5} [Jammy Furniture Mod] (1.6.2_Jammy_Furniture_Mod_V4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
UsefulFood{1.4.4} [UsefulFood] (UsefulFood-1.6.2_1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 4 (224 bytes; 0 MB) allocated, 4 (224 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Mojamajasigni'/10, l='Sarah', x=-2161.18, y=64.00, z=-435.02]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

I was playing it perfect fine yesterday, and for like 20 minutes or so today before it crashed.

Hello,

I've got a similar stack trace with exactly the same top 4 rows. And I also can't find a solution or root cause of this problem!

http://pastebin.com/aFQiX3EH

Wrong section

http://www.minecraftforum.net/forum/151-unmodified-minecraft-client-support/