I joined my server that was recently updated to the 14w18a snapshot, and right as I joined the game crashed. Help?

Title shows "11w18a". There was no snapshot released in the 18th week of 2011.

This is also invalid, as it pertains to a server.

@Blah - just because it is a server does NOT make it invalid by default

@Ian Martin - Please attach the server crash report

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

Time: 5/1/14 4:29 PM
Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
	at cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)
	at bxl.b(SourceFile:937)
	at bjf.ai(SourceFile:828)
	at bjf.f(SourceFile:755)
	at net.minecraft.client.main.Main.main(SourceFile:121)


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

-- Head --
Stacktrace:
	at cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)

-- Entity being rendered --
Details:
	Entity Type: ItemFrame (uh)
	Entity ID: 410
	Entity Name: entity.ItemFrame.name
	Entity's Exact location: -1612.50, 83.50, 820.97
	Entity's Block location: -1613.00,83.00,820.00 - World: (-1613,83,820), Chunk: (at 3,5,4 in -101,51; contains blocks -1616,0,816 to -1601,255,831), Region: (-4,1; contains chunks -128,32 to -97,63, blocks -2048,0,512 to -1537,255,1023)
	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: cce@5d08e435
	Location: -4.55,2.50,3.55 - World: (-5,2,3), Chunk: (at 11,0,3 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Rotation: -180.0
	Delta: 0.5164652
Stacktrace:
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bxb['ianrm'/403, l='MpServer', x=-1607.95, y=81.00, z=817.42]]
	Chunk stats: MultiplayerChunkCache: 80, 80
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: -80.00,75.00,610.00 - World: (-80,75,610), Chunk: (at 0,4,2 in -5,38; contains blocks -80,0,608 to -65,255,623), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
	Level time: 72384020 game time, 70177721 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: false. Cheats: false
	Forced entities: 46 total; [aay['Skeleton'/550, l='MpServer', x=-1543.47, y=71.00, z=813.88], uh['entity.ItemFrame.name'/410, l='MpServer', x=-1612.50, y=83.50, z=820.97], bxb['ianrm'/403, l='MpServer', x=-1607.95, y=81.00, z=817.42], uh['entity.ItemFrame.name'/411, l='MpServer', x=-1613.97, y=82.50, z=819.50], uh['entity.ItemFrame.name'/408, l='MpServer', x=-1612.50, y=81.50, z=820.97], uh['entity.ItemFrame.name'/409, l='MpServer', x=-1612.50, y=82.50, z=820.97], aaa['Enderman'/683, l='MpServer', x=-1636.50, y=48.00, z=877.50], uh['entity.ItemFrame.name'/414, l='MpServer', x=-1613.97, y=82.50, z=818.50], uh['entity.ItemFrame.name'/415, l='MpServer', x=-1613.97, y=81.50, z=818.50], aay['Skeleton'/544, l='MpServer', x=-1556.50, y=73.00, z=762.50], uh['entity.ItemFrame.name'/412, l='MpServer', x=-1613.97, y=83.50, z=819.50], uh['entity.ItemFrame.name'/413, l='MpServer', x=-1613.97, y=83.50, z=818.50], uh['entity.ItemFrame.name'/406, l='MpServer', x=-1608.97, y=70.50, z=823.50], uh['entity.ItemFrame.name'/407, l='MpServer', x=-1606.03, y=70.50, z=823.50], uh['entity.ItemFrame.name'/404, l='MpServer', x=-1606.03, y=70.50, z=819.50], zy['Creeper'/672, l='MpServer', x=-1632.50, y=50.00, z=879.50], uh['entity.ItemFrame.name'/405, l='MpServer', x=-1608.97, y=70.50, z=819.50], abg['Spider'/452, l='MpServer', x=-1669.53, y=63.00, z=875.31], aay['Skeleton'/451, l='MpServer', x=-1670.50, y=63.00, z=800.50], abl['Zombie'/450, l='MpServer', x=-1671.50, y=63.00, z=800.50], yk['Sheep'/509, l='MpServer', x=-1628.50, y=66.00, z=787.40], zg['item.tile.sapling.oak'/510, l='MpServer', x=-1627.53, y=66.00, z=784.19], zy['Creeper'/518, l='MpServer', x=-1610.50, y=27.00, z=813.50], abg['Spider'/511, l='MpServer', x=-1622.13, y=11.00, z=861.41], abl['Zombie'/519, l='MpServer', x=-1608.50, y=35.00, z=858.50], abl['Zombie'/512, l='MpServer', x=-1626.50, y=18.00, z=858.50], abl['Zombie'/513, l='MpServer', x=-1626.50, y=18.00, z=859.50], abk['Witch'/514, l='MpServer', x=-1627.50, y=12.00, z=869.50], aay['Skeleton'/515, l='MpServer', x=-1624.47, y=17.00, z=872.09], aay['Skeleton'/584, l='MpServer', x=-1560.50, y=5.00, z=823.50], xy['Bat'/525, l='MpServer', x=-1595.75, y=42.27, z=811.63], xy['Bat'/526, l='MpServer', x=-1590.28, y=42.45, z=819.09], zg['item.tile.sapling.oak'/497, l='MpServer', x=-1641.38, y=63.00, z=787.00], zy['Creeper'/498, l='MpServer', x=-1643.08, y=35.00, z=802.66], zy['Creeper'/499, l='MpServer', x=-1637.50, y=59.00, z=850.50], zy['Creeper'/671, l='MpServer', x=-1627.50, y=50.00, z=880.50], aay['Skeleton'/594, l='MpServer', x=-1662.50, y=15.00, z=838.50], xy['Bat'/531, l='MpServer', x=-1580.27, y=39.79, z=820.43], yc['Horse'/530, l='MpServer', x=-1581.91, y=83.00, z=814.53], uh['entity.ItemFrame.name'/417, l='MpServer', x=-1612.50, y=83.50, z=817.03], uh['entity.ItemFrame.name'/416, l='MpServer', x=-1612.50, y=82.50, z=817.03], aay['Skeleton'/543, l='MpServer', x=-1554.50, y=73.00, z=754.50], uh['entity.ItemFrame.name'/419, l='MpServer', x=-1612.50, y=81.50, z=817.03], aay['Skeleton'/542, l='MpServer', x=-1554.50, y=73.00, z=753.50], uh['entity.ItemFrame.name'/418, l='MpServer', x=-1613.97, y=81.50, z=819.50], abl['Zombie'/483, l='MpServer', x=-1651.50, y=63.00, z=867.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at buw.a(SourceFile:308)
	at bjf.b(SourceFile:2069)
	at bjf.f(SourceFile:764)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w18a
	Operating System: Mac OS X (x86_64) version 10.9.2
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 115821392 bytes (110 MB) / 191832064 bytes (182 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 14w18a
	LWJGL: 2.9.1
	OpenGL: Intel Iris Pro OpenGL Engine GL version 2.1 INTEL-8.24.11, Intel Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
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: [3D Stuff]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: Off (1)

Duplicate of MC-54008, as crash report shows that item frames were being rendered.

Duplicate of MC-54008 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.