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The below error happens only after the world finishes pre-loading.

---- Minecraft Crash Report ----
WARNING: coremods are present:
FMLPlugin (InventoryTweaks-1.61-dev-49.jar)
Contact their authors BEFORE contacting forge
// Oops.
Time: 6/12/16 8:20 AM
Description: Ticking player
java.lang.NullPointerException: Ticking player
at net.minecraft.world.World.func_180495_p(World.java:828)
at net.minecraft.world.World.func_72875_a(World.java:2213)
at net.minecraft.entity.Entity.func_180799_ab(Entity.java:1161)
at net.minecraft.entity.Entity.func_70030_z(Entity.java:457)
at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:212)
at net.minecraft.entity.Entity.func_70071_h_(Entity.java:351)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1880)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:226)
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:301)
at net.minecraft.network.NetHandlerPlayServer.func_73660_a(NetHandlerPlayServer.java:163)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:193)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:286)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:728)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:609)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at net.minecraft.world.World.func_180495_p(World.java:828)
at net.minecraft.world.World.func_72875_a(World.java:2213)
at net.minecraft.entity.Entity.func_180799_ab(Entity.java:1161)
at net.minecraft.entity.Entity.func_70030_z(Entity.java:457)
at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:212)
at net.minecraft.entity.Entity.func_70071_h_(Entity.java:351)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1880)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:226)
-- Player being ticked --
Details:
Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
Entity ID: 107
Entity Name: Selonianth
Entity's Exact location: 727.67, 75.00, 576.17
Entity's Block location: World: (727,75,576), Chunk: (at 7,4,0 in 45,36; contains blocks 720,0,576 to 735,255,591), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:301)
at net.minecraft.network.NetHandlerPlayServer.func_73660_a(NetHandlerPlayServer.java:163)
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:193)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:286)
-- Ticking connection --
Details:
Connection: [email protected]
Stacktrace:
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:728)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:609)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
at java.lang.Thread.run(Thread.java:745)
-- System Details --
Details:
Minecraft Version: 1.9
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 287768936 bytes (274 MB) / 650354688 bytes (620 MB) up to 6429081600 bytes (6131 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.23 Powered by Forge 12.16.1.1887 Optifine OptiFine_1.9_HD_U_B5 5 mods loaded, 5 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.9-12.16.1.1887.jar)
UCHIJAAAA Forge{12.16.1.1887} [Minecraft Forge] (forge-1.9-12.16.1.1887.jar)
UCHIJAAAA inventorytweaks{1.61-dev-49-c5b6395} [Inventory Tweaks] (InventoryTweaks-1.61-dev-49.jar)
UCHIJAAAA chunkbase_villageinfo_ssp{2.1} [Village Info (SSP)] (VillageInfoSSP-1.9-2.1.jar)
Loaded coremods (and transformers):
FMLPlugin (InventoryTweaks-1.61-dev-49.jar)
invtweaks.forge.asm.ContainerTransformer
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['Selonianth'/107, l='Selonia', x=727.67, y=75.00, z=576.17]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.9_HD_U_B5
Render Distance Chunks: 30
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.5.0 NVIDIA 361.75
OpenGlRenderer: GeForce GTX 960/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 4