I was walking around in my minecraft world, the game suddenly crashes, and gives me this Crash Report:

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 02.07.14 16:53
Description: Rendering entity in world

java.lang.IllegalArgumentException: Cannot set property azi

to down on block minecraft:chest, it is not an allowed value
at ayx.a(SourceFile:132)
at apr.b(SourceFile:425)
at cfb.a(SourceFile:85)
at cfb.a(SourceFile:113)
at cjg.a(SourceFile:116)
at cjg.a(SourceFile:95)
at cjg.a(SourceFile:15)
at cic.a(SourceFile:272)
at cic.a(SourceFile:237)
at cic.a(SourceFile:204)
at cei.a(SourceFile:501)
at cdo.a(SourceFile:1194)
at cdo.a(SourceFile:1121)
at cdo.b(SourceFile:973)
at bmi.ap(SourceFile:886)
at bmi.a(SourceFile:303)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at ayx.a(SourceFile:132)
at apr.b(SourceFile:425)
at cfb.a(SourceFile:85)
at cfb.a(SourceFile:113)
at cjg.a(SourceFile:116)
at cjg.a(SourceFile:95)
at cjg.a(SourceFile:15)

– Entity being rendered –
Details:
Entity Type: MinecartChest (aat)
Entity ID: 111
Entity Name: container.minecart
Entity's Exact location: 68,50, 32,06, 1371,50
Entity's Block location: 68,00,32,00,1371,00 - World: (68,32,1371), Chunk: (at 4,2,11 in 4,85; contains blocks 64,0,1360 to 79,255,1375), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Entity's Momentum: 0,00, 0,00, 0,00
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null

– Renderer details –
Details:
Assigned renderer: cjg@bb25335
Location: -38,99,-40,19,-9,23 - World: (-39,-41,-10), Chunk: (at 9,-3,6 in -3,-1; contains blocks -48,0,-16 to -33,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Rotation: 0.0
Delta: 0.6758094
Stacktrace:
at cic.a(SourceFile:272)
at cic.a(SourceFile:237)
at cic.a(SourceFile:204)
at cei.a(SourceFile:501)
at cdo.a(SourceFile:1194)
at cdo.a(SourceFile:1121)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [ccy['schwabfl'/41, l='MpServer', x=107,39, y=72,25, z=1380,78]]
Chunk stats: MultiplayerChunkCache: 1036, 1036
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: -232,00,64,00,20,00 - World: (-232,64,20), Chunk: (at 8,4,4 in -15,1; contains blocks -240,0,16 to -225,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 95662 game time, 171999 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: true. Cheats: false
Forced entities: 97 total; [yz['Bat'/15536, l='MpServer', x=85,62, y=27,87, z=1391,90], yz['Bat'/16275, l='MpServer', x=179,01, y=18,04, z=1439,91], acm['Skeleton'/42, l='MpServer', x=182,50, y=23,00, z=1373,50], ccy['schwabfl'/41, l='MpServer', x=107,39, y=72,25, z=1380,78], acy['Witch'/7365, l='MpServer', x=53,50, y=33,00, z=1364,50], acy['Witch'/7366, l='MpServer', x=52,34, y=33,00, z=1364,84], acm['Skeleton'/7360, l='MpServer', x=54,59, y=33,00, z=1367,06], acz['Zombie'/3298, l='MpServer', x=167,00, y=28,00, z=1457,56], yz['Bat'/5744, l='MpServer', x=73,79, y=27,18, z=1394,43], acm['Skeleton'/12592, l='MpServer', x=31,50, y=29,00, z=1316,50], abh['Creeper'/13903, l='MpServer', x=72,61, y=20,00, z=1369,85], aap['item.tile.rail'/4467, l='MpServer', x=160,88, y=5,00, z=1416,81], aap['item.tile.rail'/4472, l='MpServer', x=159,34, y=5,00, z=1425,19], acm['Skeleton'/7358, l='MpServer', x=54,50, y=33,00, z=1364,50], acm['Skeleton'/10648, l='MpServer', x=168,50, y=28,00, z=1341,50], abh['Creeper'/13904, l='MpServer', x=74,50, y=20,02, z=1371,50], aat['container.minecart'/94, l='MpServer', x=39,50, y=19,06, z=1348,50], abj['Enderman'/13908, l='MpServer', x=73,50, y=20,02, z=1373,50], aap['item.tile.torch'/98, l='MpServer', x=49,47, y=19,00, z=1330,53], aat['container.minecart'/110, l='MpServer', x=66,50, y=30,06, z=1319,50], aat['container.minecart'/111, l='MpServer', x=68,50, y=32,06, z=1371,50], aap['item.tile.rail'/119, l='MpServer', x=86,59, y=24,00, z=1343,41], aap['item.tile.rail'/118, l='MpServer', x=87,19, y=24,00, z=1342,50], aap['item.tile.rail'/117, l='MpServer', x=84,16, y=24,00, z=1343,88], aap['item.item.seeds'/115, l='MpServer', x=70,81, y=63,00, z=1415,72], zl['Rabbit'/114, l='MpServer', x=68,66, y=71,00, z=1367,53], zl['Rabbit'/113, l='MpServer', x=72,50, y=71,00, z=1372,53], zl['Rabbit'/112, l='MpServer', x=83,50, y=70,00, z=1375,50], aat['container.minecart'/127, l='MpServer', x=109,50, y=20,06, z=1459,50], aap['item.tile.rail'/126, l='MpServer', x=111,59, y=23,00, z=1351,53], zl['Rabbit'/125, l='MpServer', x=105,69, y=69,00, z=1341,53], zl['Rabbit'/124, l='MpServer', x=116,78, y=71,22, z=1328,47], zl['Rabbit'/123, l='MpServer', x=107,53, y=69,00, z=1343,47], acu['Spider'/6609, l='MpServer', x=40,50, y=29,00, z=1358,50], aap['item.tile.rail'/120, l='MpServer', x=88,06, y=24,00, z=1343,34], aap['item.tile.torch'/137, l='MpServer', x=112,16, y=23,00, z=1356,81], yz['Bat'/4536, l='MpServer', x=112,88, y=27,00, z=1329,73], aat['container.minecart'/136, l='MpServer', x=120,50, y=28,06, z=1339,50], aap['item.tile.rail'/139, l='MpServer', x=112,47, y=23,00, z=1356,88], aap['item.tile.torch'/138, l='MpServer', x=112,06, y=23,00, z=1358,84], aap['item.tile.flower2.poppy'/141, l='MpServer', x=116,13, y=68,00, z=1358,09], aap['item.tile.flower2.poppy'/140, l='MpServer', x=119,56, y=69,00, z=1359,47], acz['Zombie'/143, l='MpServer', x=132,63, y=34,00, z=1439,13], abh['Creeper'/142, l='MpServer', x=118,50, y=34,00, z=1431,50], zl['Rabbit'/152, l='MpServer', x=140,78, y=69,00, z=1361,25], acu['Spider'/153, l='MpServer', x=138,66, y=18,00, z=1377,09], acz['Zombie'/9603, l='MpServer', x=138,50, y=18,00, z=1374,50], acu['Spider'/154, l='MpServer', x=138,69, y=18,00, z=1380,47], abh['Creeper'/155, l='MpServer', x=139,13, y=18,00, z=1383,16], abh['Creeper'/156, l='MpServer', x=132,59, y=18,00, z=1380,00], yz['Bat'/8408, l='MpServer', x=74,88, y=31,04, z=1363,75], yz['Bat'/8406, l='MpServer', x=85,87, y=30,42, z=1363,42], acz['Zombie'/144, l='MpServer', x=126,88, y=35,00, z=1438,44], acm['Skeleton'/11536, l='MpServer', x=160,47, y=9,95, z=1440,74], acu['Spider'/9608, l='MpServer', x=134,50, y=18,00, z=1372,50], yz['Bat'/8407, l='MpServer', x=74,71, y=31,75, z=1365,92], acz['Zombie'/145, l='MpServer', x=123,50, y=35,00, z=1440,50], aat['container.minecart'/146, l='MpServer', x=114,50, y=20,06, z=1459,50], acm['Skeleton'/9611, l='MpServer', x=139,50, y=18,00, z=1375,50], yz['Bat'/8404, l='MpServer', x=83,30, y=31,19, z=1362,92], aat['container.minecart'/150, l='MpServer', x=134,50, y=24,06, z=1349,50], acz['Zombie'/151, l='MpServer', x=139,09, y=25,00, z=1363,38], acm['Skeleton'/6131, l='MpServer', x=75,50, y=23,00, z=1359,50], abh['Creeper'/175, l='MpServer', x=174,22, y=33,00, z=1323,34], yz['Bat'/8427, l='MpServer', x=71,52, y=22,09, z=1352,54], acm['Skeleton'/12484, l='MpServer', x=41,50, y=19,00, z=1348,50], aap['item.tile.flower2.poppy'/2110, l='MpServer', x=118,13, y=67,00, z=1363,19], acm['Skeleton'/166, l='MpServer', x=147,88, y=20,00, z=1450,66], zl['Rabbit'/165, l='MpServer', x=150,47, y=68,00, z=1358,44], zl['Rabbit'/164, l='MpServer', x=141,66, y=69,00, z=1350,69], aat['container.minecart'/187, l='MpServer', x=160,50, y=19,06, z=1445,50], acy['Witch'/184, l='MpServer', x=162,69, y=24,00, z=1350,69], aap['item.tile.rail'/4494, l='MpServer', x=160,88, y=5,00, z=1415,97], acm['Skeleton'/190, l='MpServer', x=159,50, y=29,00, z=1447,88], aap['item.tile.rail'/4495, l='MpServer', x=158,44, y=5,00, z=1424,16], acz['Zombie'/178, l='MpServer', x=167,41, y=27,00, z=1334,13], acy['Witch'/179, l='MpServer', x=163,66, y=24,00, z=1346,72], aap['item.tile.rail'/4480, l='MpServer', x=159,25, y=5,00, z=1413,81], acm['Skeleton'/176, l='MpServer', x=162,84, y=35,00, z=1326,50], acm['Skeleton'/182, l='MpServer', x=175,06, y=34,00, z=1329,50], abh['Creeper'/6126, l='MpServer', x=76,38, y=23,00, z=1362,00], acu['Spider'/180, l='MpServer', x=175,69, y=23,00, z=1339,31], abh['Creeper'/181, l='MpServer', x=168,50, y=38,00, z=1328,50], abh['Creeper'/206, l='MpServer', x=188,50, y=17,00, z=1459,50], acm['Skeleton'/201, l='MpServer', x=182,50, y=23,00, z=1377,50], yz['Bat'/16194, l='MpServer', x=180,69, y=24,90, z=1341,02], aap['item.tile.gravel'/2117, l='MpServer', x=52,88, y=29,00, z=1358,66], aap['item.tile.rail'/3374, l='MpServer', x=166,69, y=24,00, z=1353,91], aap['item.tile.rail'/3375, l='MpServer', x=172,25, y=24,00, z=1354,88], yz['Bat'/16494, l='MpServer', x=74,27, y=32,05, z=1382,56], aap['item.tile.rail'/3365, l='MpServer', x=167,81, y=24,00, z=1354,69], aap['item.tile.rail'/3366, l='MpServer', x=171,16, y=24,00, z=1354,56], acu['Spider'/14342, l='MpServer', x=161,93, y=28,00, z=1449,65], acm['Skeleton'/14347, l='MpServer', x=165,50, y=28,02, z=1455,50], acm['Skeleton'/14346, l='MpServer', x=164,50, y=28,02, z=1452,50], yz['Bat'/16511, l='MpServer', x=133,10, y=28,33, z=1326,51], acm['Skeleton'/14348, l='MpServer', x=168,50, y=28,02, z=1450,50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bza.a(SourceFile:310)
at bmi.b(SourceFile:2135)
at bmi.a(SourceFile:312)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 14w27a
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 106200488 bytes (101 MB) / 626524160 bytes (597 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 14w27a
LWJGL: 2.9.1
OpenGL: GeForce GTX 650/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)