Summoning Barrier as FallingSand Entity crashes the game

Summoning a Barrier as a FallingSand Entity crashes the game.

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 1/30/14 12:42 PM
Description: Rendering entity in world

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.get(ArrayList.java:324)
	at bqm.a(SourceFile:108)
	at btx.a(SourceFile:63)
	at btx.a(SourceFile:19)
	at btu.a(SourceFile:207)
	at btu.a(SourceFile:190)
	at btu.a(SourceFile:167)
	at bpx.a(SourceFile:383)
	at bpq.a(SourceFile:1134)
	at bpq.b(SourceFile:923)
	at bcf.ag(SourceFile:803)
	at bcf.f(SourceFile:730)
	at net.minecraft.client.main.Main.main(SourceFile:154)


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

-- Head --
Stacktrace:
	at java.util.ArrayList.get(ArrayList.java:324)
	at bqm.a(SourceFile:108)
	at btx.a(SourceFile:63)
	at btx.a(SourceFile:19)

-- Entity being rendered --
Details:
	Entity Type: FallingSand (xo)
	Entity ID: 38446
	Entity Name: Falling Block
	Entity's Exact location: 29999998.50, 68.96, 268.50
	Entity's Block location: 29999998.00,68.00,268.00 - World: (29999998,68,268), Chunk: (at 14,4,12 in 1874999,16; contains blocks 29999984,0,256 to 29999999,255,271), Region: (58593,0; contains chunks 1874976,0 to 1875007,31, blocks 29999616,0,0 to 30000127,255,511)
	Entity's Momentum: 0.00, -0.04, 0.00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
	Immitating block ID: 166
	Immitating block data: 0

-- Renderer details --
Details:
	Assigned renderer: btx@40d21187
	Location: 0.46,-1.15,-0.04 - World: (0,-2,-1), Chunk: (at 0,-1,15 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Rotation: 0.0
	Delta: 0.06477964
Stacktrace:
	at btu.a(SourceFile:207)
	at btu.a(SourceFile:190)
	at btu.a(SourceFile:167)
	at bpx.a(SourceFile:383)
	at bpq.a(SourceFile:1134)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bpg['ezekielelin'/234, l='MpServer', x=29999998.04, y=70.15, z=268.54]]
	Chunk stats: MultiplayerChunkCache: 543, 543
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 141.00,64.00,291.00 - World: (141,64,291), Chunk: (at 13,4,3 in 8,18; contains blocks 128,0,288 to 143,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 2664 game time, 2664 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: spectator (ID 3). Hardcore: false. Cheats: false
	Forced entities: 133 total; [xo['Falling Block'/38467, l='MpServer', x=29999940.00, y=56.49, z=237.50], yx['Zombie'/8802, l='MpServer', x=29999992.00, y=34.00, z=226.50], xo['Falling Block'/38466, l='MpServer', x=29999944.00, y=42.49, z=125.50], yx['Zombie'/2745, l='MpServer', x=29999982.03, y=50.00, z=231.50], wj['Bat'/559, l='MpServer', x=29999919.91, y=14.35, z=307.08], yx['Zombie'/7420, l='MpServer', x=29999996.00, y=33.00, z=227.50], xo['Falling Block'/38477, l='MpServer', x=29999880.00, y=31.49, z=304.50], xo['Falling Block'/38479, l='MpServer', x=29999936.00, y=38.49, z=372.50], xo['Falling Block'/38478, l='MpServer', x=29999880.00, y=60.49, z=398.50], xo['Falling Block'/38480, l='MpServer', x=29999948.00, y=29.49, z=175.50], wj['Bat'/804, l='MpServer', x=30000011.84, y=2.83, z=220.63], wj['Bat'/565, l='MpServer', x=29999918.73, y=17.84, z=305.81], wt['Pig'/806, l='MpServer', x=29999994.19, y=75.00, z=330.66], xo['Falling Block'/38485, l='MpServer', x=29999996.00, y=7.49, z=411.50], yg['Creeper'/4865, l='MpServer', x=29999944.06, y=33.00, z=321.47], wj['Bat'/560, l='MpServer', x=29999929.44, y=21.65, z=314.76], ys['Skeleton'/32051, l='MpServer', x=29999976.00, y=32.00, z=262.50], bpg['ezekielelin'/234, l='MpServer', x=29999998.04, y=70.15, z=268.54], yx['Zombie'/2950, l='MpServer', x=29999938.00, y=33.00, z=320.50], yx['Zombie'/32570, l='MpServer', x=29999998.00, y=13.00, z=282.50], wl['Chicken'/774, l='MpServer', x=29999996.13, y=71.00, z=348.19], wl['Chicken'/772, l='MpServer', x=29999993.53, y=71.00, z=346.31], xa['Wolf'/770, l='MpServer', x=29999987.94, y=65.00, z=306.34], wt['Pig'/771, l='MpServer', x=29999998.00, y=74.00, z=336.50], wt['Pig'/768, l='MpServer', x=29999985.81, y=66.00, z=285.69], wt['Pig'/769, l='MpServer', x=29999984.06, y=67.00, z=317.13], yx['Zombie'/37430, l='MpServer', x=29999992.00, y=34.00, z=220.50], yx['Zombie'/37431, l='MpServer', x=29999992.00, y=34.00, z=219.50], ys['Skeleton'/36549, l='MpServer', x=29999996.00, y=35.00, z=264.50], ys['Skeleton'/36548, l='MpServer', x=29999996.00, y=35.00, z=262.50], ys['Skeleton'/5202, l='MpServer', x=29999996.72, y=16.00, z=275.75], ys['Skeleton'/36550, l='MpServer', x=29999996.00, y=35.00, z=261.50], wj['Bat'/4012, l='MpServer', x=29999997.69, y=25.10, z=242.69], yg['Creeper'/631, l='MpServer', x=29999948.00, y=64.00, z=304.50], wt['Pig'/630, l='MpServer', x=29999938.00, y=64.00, z=208.50], wt['Pig'/629, l='MpServer', x=29999945.50, y=64.00, z=205.69], wt['Pig'/628, l='MpServer', x=29999940.00, y=64.00, z=207.50], ys['Skeleton'/632, l='MpServer', x=29999940.00, y=20.00, z=320.50], yh['Enderman'/6852, l='MpServer', x=29999996.00, y=37.00, z=228.34], wl['Chicken'/6370, l='MpServer', x=29999999.47, y=29.00, z=215.47], yx['Zombie'/6369, l='MpServer', x=29999999.41, y=29.35, z=215.55], xo['Falling Block'/38446, l='MpServer', x=29999998.50, y=68.96, z=268.50], yg['Creeper'/599, l='MpServer', x=29999931.38, y=15.00, z=313.00], xo['Falling Block'/38462, l='MpServer', x=29999880.00, y=31.49, z=303.50], xo['Falling Block'/38460, l='MpServer', x=29999860.00, y=46.49, z=288.50], wl['Chicken'/603, l='MpServer', x=29999921.47, y=64.00, z=338.63], ys['Skeleton'/5377, l='MpServer', x=29999944.00, y=33.00, z=318.50], xo['Falling Block'/38461, l='MpServer', x=29999856.00, y=46.49, z=289.50], xo['Falling Block'/38458, l='MpServer', x=29999860.00, y=46.49, z=287.50], xo['Falling Block'/38459, l='MpServer', x=29999856.00, y=47.49, z=287.50], wl['Chicken'/604, l='MpServer', x=29999923.19, y=64.00, z=340.47], xo['Falling Block'/38457, l='MpServer', x=29999860.00, y=21.49, z=274.50], yx['Zombie'/673, l='MpServer', x=29999954.50, y=64.00, z=313.03], xp['item.item.chickenRaw'/672, l='MpServer', x=29999953.88, y=68.13, z=306.19], ys['Skeleton'/702, l='MpServer', x=29999974.00, y=33.00, z=259.50], yx['Zombie'/4282, l='MpServer', x=29999998.00, y=34.00, z=264.50], wt['Pig'/703, l='MpServer', x=29999980.59, y=65.00, z=311.19], yg['Creeper'/700, l='MpServer', x=29999980.00, y=20.00, z=251.50], yu['Spider'/10309, l='MpServer', x=29999994.50, y=49.00, z=241.41], ys['Skeleton'/701, l='MpServer', x=29999984.59, y=17.00, z=244.84], wm['Cow'/698, l='MpServer', x=29999976.53, y=68.00, z=225.47], wm['Cow'/699, l='MpServer', x=29999975.47, y=69.00, z=226.53], wm['Cow'/696, l='MpServer', x=29999970.50, y=69.00, z=229.25], wm['Cow'/697, l='MpServer', x=29999970.50, y=65.00, z=221.31], yx['Zombie'/694, l='MpServer', x=29999978.44, y=46.00, z=238.94], wm['Cow'/695, l='MpServer', x=29999976.25, y=69.00, z=232.28], yu['Spider'/34245, l='MpServer', x=29999979.68, y=33.00, z=246.81], yg['Creeper'/693, l='MpServer', x=29999968.59, y=51.00, z=232.97], yg['Creeper'/690, l='MpServer', x=29999985.31, y=50.00, z=238.06], yg['Creeper'/691, l='MpServer', x=29999970.38, y=51.00, z=227.97], yg['Creeper'/3435, l='MpServer', x=29999968.00, y=30.00, z=280.50], wj['Bat'/34046, l='MpServer', x=30000001.86, y=16.16, z=278.79], wl['Chicken'/668, l='MpServer', x=29999953.47, y=68.00, z=309.44], wl['Chicken'/669, l='MpServer', x=29999956.00, y=67.00, z=308.50], xp['item.item.feather'/670, l='MpServer', x=29999954.22, y=68.13, z=304.53], xp['item.item.feather'/671, l='MpServer', x=29999953.88, y=68.13, z=305.44], wl['Chicken'/664, l='MpServer', x=29999960.41, y=66.00, z=301.50], xp['item.item.feather'/665, l='MpServer', x=29999956.72, y=68.13, z=295.16], xp['item.item.chickenRaw'/666, l='MpServer', x=29999956.19, y=68.13, z=295.16], wl['Chicken'/667, l='MpServer', x=29999952.00, y=68.00, z=308.50], wx['Squid'/660, l='MpServer', x=29999957.63, y=61.38, z=224.50], ys['Skeleton'/661, l='MpServer', x=29999966.50, y=44.00, z=227.84], wl['Chicken'/662, l='MpServer', x=29999967.56, y=67.00, z=290.44], wl['Chicken'/663, l='MpServer', x=29999960.34, y=67.00, z=298.56], wt['Pig'/657, l='MpServer', x=29999964.00, y=63.00, z=202.50], wt['Pig'/658, l='MpServer', x=29999964.00, y=63.00, z=202.50], wt['Pig'/659, l='MpServer', x=29999965.69, y=71.00, z=203.41], yx['Zombie'/747, l='MpServer', x=29999984.06, y=29.00, z=255.38], ys['Skeleton'/746, l='MpServer', x=29999985.63, y=16.00, z=248.31], yu['Spider'/744, l='MpServer', x=29999985.00, y=20.00, z=253.28], yx['Zombie'/1154, l='MpServer', x=29999979.84, y=20.00, z=252.34], wj['Bat'/750, l='MpServer', x=30000008.79, y=18.06, z=246.70], yx['Zombie'/1156, l='MpServer', x=29999975.84, y=20.00, z=250.34], yu['Spider'/749, l='MpServer', x=29999983.28, y=17.00, z=244.72], yg['Creeper'/748, l='MpServer', x=29999979.53, y=31.00, z=244.78], ys['Skeleton'/738, l='MpServer', x=29999986.97, y=50.00, z=237.16], yg['Creeper'/8870, l='MpServer', x=29999997.97, y=16.00, z=278.50], ys['Skeleton'/736, l='MpServer', x=29999989.91, y=34.00, z=222.56], wm['Cow'/743, l='MpServer', x=29999988.00, y=83.00, z=227.50], wm['Cow'/742, l='MpServer', x=29999980.53, y=71.00, z=219.38], wm['Cow'/741, l='MpServer', x=29999976.09, y=69.00, z=240.06], ys['Skeleton'/740, l='MpServer', x=29999987.00, y=50.00, z=238.59], ys['Skeleton'/762, l='MpServer', x=29999991.94, y=21.00, z=261.53], yu['Spider'/763, l='MpServer', x=29999992.00, y=21.00, z=257.50], wj['Bat'/1000, l='MpServer', x=29999991.56, y=16.10, z=249.41], yg['Creeper'/760, l='MpServer', x=29999997.41, y=48.00, z=246.00], xp['item.tile.gravel'/761, l='MpServer', x=29999998.94, y=68.13, z=244.25], wt['Pig'/766, l='MpServer', x=29999999.22, y=67.00, z=265.06], wt['Pig'/767, l='MpServer', x=29999987.97, y=65.00, z=290.13], yg['Creeper'/764, l='MpServer', x=29999998.78, y=55.00, z=269.73], ys['Skeleton'/765, l='MpServer', x=29999998.25, y=16.00, z=276.84], xp['item.tile.gravel'/754, l='MpServer', x=29999998.88, y=58.13, z=243.84], xp['item.tile.gravel'/755, l='MpServer', x=29999999.34, y=59.13, z=240.69], yg['Creeper'/752, l='MpServer', x=29999992.00, y=33.00, z=247.50], xp['item.tile.gravel'/753, l='MpServer', x=29999999.22, y=58.13, z=242.88], yg['Creeper'/759, l='MpServer', x=29999996.38, y=48.00, z=242.31], xp['item.tile.gravel'/756, l='MpServer', x=29999998.88, y=58.13, z=242.13], wj['Bat'/999, l='MpServer', x=29999989.88, y=23.10, z=255.28], xp['item.tile.gravel'/757, l='MpServer', x=29999998.38, y=59.13, z=240.47], ys['Skeleton'/11391, l='MpServer', x=29999992.00, y=26.00, z=220.50], xa['Wolf'/236, l='MpServer', x=29999999.53, y=66.00, z=302.25], xa['Wolf'/235, l='MpServer', x=29999986.50, y=63.00, z=295.85], yu['Spider'/15984, l='MpServer', x=29999975.16, y=51.00, z=230.56], wj['Bat'/37340, l='MpServer', x=29999918.72, y=13.92, z=306.06], yu['Spider'/34931, l='MpServer', x=29999999.03, y=24.00, z=219.00], yg['Creeper'/1924, l='MpServer', x=29999988.00, y=40.00, z=245.50], yu['Spider'/35879, l='MpServer', x=29999981.01, y=28.49, z=254.47], yx['Zombie'/734, l='MpServer', x=29999994.00, y=26.00, z=222.50], yg['Creeper'/735, l='MpServer', x=29999990.00, y=23.00, z=208.50], wj['Bat'/7715, l='MpServer', x=29999985.91, y=30.00, z=243.63], yw['Witch'/32490, l='MpServer', x=29999972.00, y=22.00, z=191.50], yg['Creeper'/17224, l='MpServer', x=29999966.31, y=43.00, z=231.50], ys['Skeleton'/36632, l='MpServer', x=29999986.00, y=40.00, z=248.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bne.a(SourceFile:298)
	at bcf.b(SourceFile:2010)
	at bcf.f(SourceFile:739)
	at net.minecraft.client.main.Main.main(SourceFile:154)

-- System Details --
Details:
	Minecraft Version: 14w05a
	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: 111489400 bytes (106 MB) / 365817856 bytes (348 MB) up to 4277534720 bytes (4079 MB)
	JVM Flags: 1 total; -Xmx4G
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 14w05a
	LWJGL: 2.9.1
	OpenGL: AMD Radeon HD 6770M OpenGL Engine GL version 2.1 ATI-1.20.9, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
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: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: Off (1)