Crash Report

---- Minecraft Crash Report ----
// Oops.

Time: 7/1/17 9:49 PM
Description: Ticking player

java.lang.NullPointerException: Ticking player
	at net.minecraft.item.ItemStack.areItemStacksEqual(ItemStack.java:495)
	at net.minecraft.inventory.Container.detectAndSendChanges(Container.java:100)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdate(EntityPlayerMP.java:365)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2141)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:872)
	at net.minecraft.world.World.updateEntity(World.java:2101)
	at net.minecraft.world.WorldServer.tickPlayers(WorldServer.java:673)
	at net.minecraft.world.World.updateEntities(World.java:1888)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:644)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:836)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:740)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:589)
	at java.lang.Thread.run(Thread.java:748)


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

-- Head --
Thread: Server thread
Stacktrace:
	at net.minecraft.item.ItemStack.areItemStacksEqual(ItemStack.java:495)
	at net.minecraft.inventory.Container.detectAndSendChanges(Container.java:100)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdate(EntityPlayerMP.java:365)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2141)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:872)
	at net.minecraft.world.World.updateEntity(World.java:2101)

-- Player being ticked --
Details:
	Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
	Entity ID: 28
	Entity Name: Player661
	Entity's Exact location: 124.97, 63.00, -166.64
	Entity's Block location: World: (124,63,-167), Chunk: (at 12,3,9 in 7,-11; contains blocks 112,0,-176 to 127,255,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.world.WorldServer.tickPlayers(WorldServer.java:673)
	at net.minecraft.world.World.updateEntities(World.java:1888)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:644)

-- Affected level --
Details:
	Level name: Test World
	All players: 1 total; [EntityPlayerMP['Player661'/28, l='Test World', x=124.97, y=63.00, z=-166.64]]
	Chunk stats: ServerChunkCache: 1089 Drop: 0
	Level seed: -8831713433277173097
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 3;minecraft:bedrock,61*minecraft:dirt,minecraft:grass;1;village
	Level spawn location: World: (119,4,-177), Chunk: (at 7,0,15 in 7,-12; contains blocks 112,0,-192 to 127,255,-177), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 37794 game time, 6000 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 26740 (now: false), thunder time: 1598 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:836)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:740)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:589)
	at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
	Minecraft Version: 1.12
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_131, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 552212176 bytes (526 MB) / 1202716672 bytes (1147 MB) up to 2846883840 bytes (2715 MB)
	JVM Flags: 0 total;
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.40 Powered by Forge 14.21.1.2387 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	minecraft{1.12} [Minecraft] (minecraft.jar)
	UCHIJAAAA	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
	UCHIJAAAA	FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.12-14.21.1.2387.jar)
	UCHIJAAAA	forge{14.21.1.2387} [Minecraft Forge] (forgeSrc-1.12-14.21.1.2387.jar)
	UCHIJAAAA	alchemtrans{0.0.1} [Alchemical Transmutation] (Alchemical_Transmutation_main)
	Loaded coremods (and transformers):
	GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [EntityPlayerMP['Player661'/28, l='Test World', x=124.97, y=63.00, z=-166.64]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'