---- Minecraft Crash Report ----
// Sorry :(

Time: 2015/01/01 6:42 PM
Description: Exception in server tick loop

java.lang.NullPointerException
	at net.minecraft.server.MinecraftServer.c(SourceFile:801)
	at bkz.a(IntegratedServer.java:118)
	at bkz.d(IntegratedServer.java:142)
	at net.minecraft.server.MinecraftServer.run(SourceFile:315)
	at hi.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: Linux (amd64) version 3.11.0-12-generic
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 985918288 bytes (940 MB) / 1049100288 bytes (1000 MB) up to 1049100288 bytes (1000 MB)
	JVM Flags: 3 total; -Xms1024m -Xmx1024m -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: IWrUpdater, Config, VersionCheckThread, ...[cpw.mods.fml.client.FMLClientHandler, CustomModLoadingErrorDisplayException, GuiWrongMinecraft, ...], [cpw.mods.fml.client.registry.ISimpleBlockRenderingHandler, RenderingRegistry], [cpw.mods.fml.common.LoaderException, FMLCommonHandler, TickType, ...], [cpw.mods.fml.common.modloader.BaseModProxy], [cpw.mods.fml.common.network.FMLPacket, EntitySpawnPacket, EntitySpawnAdjustmentPacket, ...], [cpw.mods.fml.common.registry.EntityRegistration], [cpw.mods.fml.common.toposort.ModSortingException], [cpw.mods.fml.relauncher.Side], [net.minecraftforge.client.MinecraftForgeClient, IItemRenderer, ForgeHooksClient, ...], [net.minecraftforge.client.event.MouseEvent, FOVUpdateEvent, DrawBlockHighlightEvent, ...], [net.minecraftforge.common.MinecraftForge, ForgeInternalHandler, ForgeHooks, ...], [net.minecraftforge.event.EventBus, IEventListener, ListenerList, ...], [net.minecraftforge.event.entity.EntityEvent], [net.minecraftforge.event.entity.item.ItemEvent, ItemTossEvent], [net.minecraftforge.event.entity.living.LivingEvent, LivingSetAttackTargetEvent, LivingUpdateEvent, ...], [net.minecraftforge.event.entity.player.PlayerEvent, PlayerOpenContainerEvent], [net.minecraftforge.event.world.BlockEvent, BreakEvent, WorldEvent, ...], [net.minecraftforge.fluids.FluidRegistry, FluidRegisterEvent, Fluid, ...]
	IntCache: cache: 13, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated