Crash: java.lang.IllegalArgumentException: Cannot get property ... as it does not exist in aqu{block=minecraft:unpowered_comparator, properties=[facing, mode, powered]}

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 13/11/15 9:19 AM
Description: Exception while updating neighbours

java.lang.IllegalArgumentException: Cannot get property arg{name=shape, clazz=class ajh$b, values=[north_south, east_west, ascending_east, ascending_west, ascending_north, ascending_south]} as it does not exist in aqu{block=minecraft:unpowered_comparator, properties=[facing, mode, powered]}
	at aqu$a.c(SourceFile:165)
	at ane.a(SourceFile:115)
	at ane.a(SourceFile:102)
	at ane.b(SourceFile:136)
	at ajh.a(SourceFile:454)
	at ahm.e(SourceFile:447)
	at ahm.a(SourceFile:424)
	at akj.h(SourceFile:209)
	at ant.b(SourceFile:130)
	at arv.a(SourceFile:441)
	at ahm.a(SourceFile:312)
	at akj.b(SourceFile:68)
	at lp.a(SourceFile:646)
	at lp.d(SourceFile:215)
	at net.minecraft.server.MinecraftServer.D(SourceFile:616)
	at net.minecraft.server.MinecraftServer.C(SourceFile:552)
	at bxw.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:456)
	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 aqu$a.c(SourceFile:165)
	at ane.a(SourceFile:115)
	at ane.a(SourceFile:102)
	at ane.b(SourceFile:136)
	at ajh.a(SourceFile:454)

-- Block being updated --
Details:
	Source block type: ID #94 (tile.diode // ant)
	Block: minecraft:golden_rail[powered=true,shape=east_west]
	Block location: World: (273,61,185), Chunk: (at 1,3,9 in 17,11; contains blocks 272,0,176 to 287,255,191), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at ahm.e(SourceFile:447)
	at ahm.a(SourceFile:424)
	at akj.h(SourceFile:209)
	at ant.b(SourceFile:130)
	at arv.a(SourceFile:441)
	at ahm.a(SourceFile:312)
	at akj.b(SourceFile:68)

-- Block being ticked --
Details:
	Block: minecraft:powered_repeater[delay=1,facing=west,locked=false]
	Block location: World: (271,61,185), Chunk: (at 15,3,9 in 16,11; contains blocks 256,0,176 to 271,255,191), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at lp.a(SourceFile:646)
	at lp.d(SourceFile:215)

-- Affected level --
Details:
	Level name: New World
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: 1442321316
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (164,64,209), Chunk: (at 4,4,1 in 10,13; contains blocks 160,0,208 to 175,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 27707 game time, 27707 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 47397 (now: false), thunder time: 25367 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:616)
	at net.minecraft.server.MinecraftServer.C(SourceFile:552)
	at bxw.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:456)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 15w46a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 141027840 bytes (134 MB) / 255066112 bytes (243 MB) up to 8576565248 bytes (8179 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.