Hopper: java.lang.IllegalStateException: TickNextTick list out of synch

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-190767/

Crash:

java.lang.IllegalStateException: TickNextTick list out of synch
	at js.a(SourceFile:377)
	at js.b(SourceFile:130)

The following is the first clean report made public about this crash:

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

Time: 9/19/13 8:28 PM
Description: Exception ticking world

java.lang.IllegalStateException: TickNextTick list out of synch
	at js.a(SourceFile:377)
	at js.b(SourceFile:130)
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)


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

-- Head --
Stacktrace:
	at js.a(SourceFile:377)
	at js.b(SourceFile:130)

-- Affected level --
Details:
	Level name: Ash and Cilan And Adrien
	All players: 1 total; [jv['flashdriveman'/1324, l='Ash and Cilan And Adrien', x=-403.85, y=65.00, z=-394.00]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: 41327148
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-409,64,-403), Chunk: (at 7,4,13 in -26,-26; contains blocks -416,0,-416 to -401,255,-401), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 150 game time, 150 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 166562 (now: false), thunder time: 129302 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Mac OS X (x86_64) version 10.8.4
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 245854520 bytes (234 MB) / 642052096 bytes (612 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 8694 (486864 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 11068 (619808 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jv['flashdriveman'/1324, l='Ash and Cilan And Adrien', x=-403.85, y=65.00, z=-394.00]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-190767/12498866/