crash on giving sapling type 6

my minecraft crashed when i did /give pop1200000 minecraft:sapling 1 6
this is what appeared when i watched the crash report:

Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 27/04/14 11:50
Description: Rendering entity in world

java.lang.ArrayIndexOutOfBoundsException: 6
at atg.a(SourceFile:67)
at ahg.b_(SourceFile:40)
at agi.a(SourceFile:774)
at cbz.a(SourceFile:137)
at cbz.a(SourceFile:32)
at cbn.a(SourceFile:219)
at cbn.a(SourceFile:199)
at cbn.a(SourceFile:176)
at bxn.a(SourceFile:481)
at bxg.a(SourceFile:1146)
at bxg.b(SourceFile:937)
at bja.ai(SourceFile:828)
at bja.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 atg.a(SourceFile:67)
at ahg.b_(SourceFile:40)
at agi.a(SourceFile:774)
at cbz.a(SourceFile:137)
at cbz.a(SourceFile:32)

– Entity being rendered –
Details:
Entity Type: Item (zg)
Entity ID: 8581539
Entity Name: item.tile.sapling.oak
Entity's Exact location: -588,75, 5,25, 94,68
Entity's Block location: -589,00,5,00,94,00 - World: (-589,5,94), Chunk: (at 3,0,14 in -37,5; contains blocks -592,0,80 to -577,255,95), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Entity's Momentum: 0,12, -0,06, 0,24
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null

– Renderer details –
Details:
Assigned renderer: cbz@1d50b8f
Location: 0,02,1,30,0,04 - World: (0,1,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Rotation: 70.3125
Delta: 0.24621367
Stacktrace:
at cbn.a(SourceFile:219)
at cbn.a(SourceFile:199)
at cbn.a(SourceFile:176)
at bxn.a(SourceFile:481)
at bxg.a(SourceFile:1146)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bww['pop1200000'/8355871, l='MpServer', x=-588,86, y=4,00, z=94,46]]
Chunk stats: MultiplayerChunkCache: 30, 30
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: -589,00,4,00,91,00 - World: (-589,4,91), Chunk: (at 3,0,11 in -37,5; contains blocks -592,0,80 to -577,255,95), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Level time: 1351 game time, 1351 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: 15 total; [ya['Chicken'/8426622, l='MpServer', x=-592,50, y=4,00, z=60,50], ya['Chicken'/8426623, l='MpServer', x=-607,38, y=4,00, z=63,38], ya['Chicken'/8426621, l='MpServer', x=-595,50, y=4,00, z=61,50], yb['Cow'/8426612, l='MpServer', x=-618,06, y=4,00, z=53,66], yk['Sheep'/8426651, l='MpServer', x=-547,50, y=4,00, z=123,50], yk['Sheep'/8426650, l='MpServer', x=-547,50, y=4,00, z=125,50], yk['Sheep'/8426653, l='MpServer', x=-554,50, y=4,00, z=122,50], yk['Sheep'/8426652, l='MpServer', x=-543,06, y=-0,04, z=132,06], zg['item.tile.sapling.oak'/8581539, l='MpServer', x=-588,75, y=5,25, z=94,68], ya['Chicken'/8426624, l='MpServer', x=-592,31, y=4,00, z=61,63], yj['Pig'/8426633, l='MpServer', x=-547,19, y=4,00, z=49,34], yj['Pig'/8426634, l='MpServer', x=-547,78, y=4,00, z=52,91], bww['pop1200000'/8355871, l='MpServer', x=-588,86, y=4,00, z=94,46], yj['Pig'/8426635, l='MpServer', x=-553,78, y=4,00, z=48,50], yj['Pig'/8426636, l='MpServer', x=-550,84, y=4,00, z=50,31]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bur.a(SourceFile:308)
at bja.b(SourceFile:2069)
at bja.f(SourceFile:764)
at net.minecraft.client.main.Main.main(SourceFile:121)

– System Details –
Details:
Minecraft Version: 14w17a
Operating System: Linux (i386) version 2.6.32-57-generic
Java Version: 1.6.0_30, Sun Microsystems Inc.
Java VM Version: OpenJDK Client VM (mixed mode, sharing), Sun Microsystems Inc.
Memory: 82706376 bytes (78 MB) / 216530944 bytes (206 MB) up to 518979584 bytes (494 MB)
JVM Flags: 1 total; -Xmx512M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 14w17a
LWJGL: 2.9.1
OpenGL: Mesa DRI Intel(R) 945G GEM 20091221 2009Q4 x86/MMX/SSE2 GL version 1.4 Mesa 7.7.1, Tungsten Graphics, Inc
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because EXT_framebuffer_object is supported.
Anisotropic filtering is supported and maximum anisotropy is 4.
Shaders are not available because OpenGL 2.1 is not supported, ARB_shader_objects is supported, ARB_vertex_shader is supported, and ARB_fragment_shader is not 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)