How to reproduce:
Put a fencegate, anvil, ... down.
Face a sticky piston towards it.
Shoot an arrow in the block (not the piston)
Power the piston
This will put the world out of commission.
This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-2534598/
Crash:
java.lang.IllegalArgumentException: Cannot get property apb{name=facing, clazz=class cq, values=[north, south, west, east]} as it does not exist in aoq{block=minecraft:piston_extension, properties=[facing, type]}
at aoq$a.b(SourceFile:132)
at aje.a(SourceFile:88)
at aol.a(SourceFile:162)
at yg.t_(SourceFile:168)
at afr.a(SourceFile:1407)
at lg.a(SourceFile:600)
at afr.g(SourceFile:1385)
The following is the first clean report made public about this crash:
---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3
Time: 8/6/15 10:39 AM
Description: Ticking entity
java.lang.IllegalArgumentException: Cannot get property apb{name=facing, clazz=class cq, values=[north, south, west, east]} as it does not exist in aoq{block=minecraft:piston_extension, properties=[facing, type]}
at aoq$a.b(SourceFile:132)
at aje.a(SourceFile:88)
at aol.a(SourceFile:162)
at yg.t_(SourceFile:168)
at afr.a(SourceFile:1407)
at lg.a(SourceFile:600)
at afr.g(SourceFile:1385)
at afr.j(SourceFile:1278)
at lg.j(SourceFile:481)
at net.minecraft.server.MinecraftServer.D(SourceFile:620)
at net.minecraft.server.MinecraftServer.C(SourceFile:548)
at btp.C(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:452)
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 aoq$a.b(SourceFile:132)
at aje.a(SourceFile:88)
at aol.a(SourceFile:162)
at yg.t_(SourceFile:168)
at afr.a(SourceFile:1407)
at lg.a(SourceFile:600)
at afr.g(SourceFile:1385)
-- Entity being ticked --
Details:
Entity Type: Arrow (yg)
Entity ID: 67
Entity Name: Arrow
Entity's Exact location: 216.71, 32.81, 176.99
Entity's Block location: 216.00,32.00,176.00 - World: (216,32,176), Chunk: (at 8,2,0 in 13,11; contains blocks 208,0,176 to 223,255,191), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 2.31, -0.09, 0.24
Entity's Rider: ~~ERROR~~ NullPointerException: null
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at afr.j(SourceFile:1278)
at lg.j(SourceFile:481)
-- Affected level --
Details:
Level name: Beautiful Cookies 2.0
All players: 0 total; []
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: 5717967919303138141
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options: 3;3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: 118.00,60.00,100.00 - World: (118,60,100), Chunk: (at 6,3,4 in 7,6; contains blocks 112,0,96 to 127,255,111), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 6413295 game time, 85911 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 69346 (now: false), thunder time: 16174 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:620)
at net.minecraft.server.MinecraftServer.C(SourceFile:548)
at btp.C(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:452)
at java.lang.Thread.run(Thread.java:745)
-- System Details --
Details:
Minecraft Version: 15w32b
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 100298536 bytes (95 MB) / 210345984 bytes (200 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
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.
You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-2534598/74770241/
Is this still an issue in 15w45a? If so, please update the list of affected versions.