wood log causes crash

the screen displayed the following:

Minecraft Crash Report ----
// You're mean.

Time: 18/06/14 16:22
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot set property ayi{name=axis, clazz=class dv, values=[X, Y, Z]} as it does not exist!
at axy.a(SourceFile:128)
at atx.a(SourceFile:35)
at afg.a(SourceFile:61)
at aht.a(SourceFile:113)
at bxx.a(SourceFile:318)
at blh.ar(SourceFile:1320)
at blh.q(SourceFile:1677)
at blh.ap(SourceFile:860)
at blh.a(SourceFile:303)
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 axy.a(SourceFile:128)
at atx.a(SourceFile:35)
at afg.a(SourceFile:61)
at aht.a(SourceFile:113)
at bxx.a(SourceFile:318)
at blh.ar(SourceFile:1320)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cbw['bbscraft'/113, l='MpServer', x=183.54, y=64.25, z=148.49]]
Chunk stats: MultiplayerChunkCache: 436, 436
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 192.00,64.00,156.00 - World: (192,64,156), Chunk: (at 0,4,12 in 12,9; contains blocks 192,0,144 to 207,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 5882 game time, 5882 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: 65 total; [yn['Bat'/0, l='MpServer', x=107.56, y=32.10, z=171.47], zc['Squid'/6, l='MpServer', x=119.53, y=60.28, z=145.91], zc['Squid'/7, l='MpServer', x=126.94, y=56.84, z=176.53], yn['Bat'/8, l='MpServer', x=121.38, y=26.25, z=205.78], yn['Bat'/9, l='MpServer', x=115.41, y=33.50, z=218.44], zc['Squid'/11, l='MpServer', x=143.47, y=60.78, z=118.22], zc['Squid'/12, l='MpServer', x=131.00, y=60.16, z=145.19], zc['Squid'/13, l='MpServer', x=137.53, y=60.00, z=162.78], zc['Squid'/14, l='MpServer', x=152.78, y=62.09, z=111.13], zc['Squid'/15, l='MpServer', x=148.03, y=60.31, z=126.97], zc['Squid'/16, l='MpServer', x=148.50, y=59.94, z=124.94], zc['Squid'/17, l='MpServer', x=158.91, y=59.19, z=114.59], yq['Cow'/18, l='MpServer', x=156.09, y=63.00, z=175.91], zc['Squid'/19, l='MpServer', x=176.75, y=60.72, z=111.88], zc['Squid'/20, l='MpServer', x=171.22, y=61.25, z=107.09], yq['Cow'/21, l='MpServer', x=165.91, y=63.00, z=141.91], yq['Cow'/22, l='MpServer', x=166.38, y=63.00, z=138.19], yq['Cow'/23, l='MpServer', x=174.94, y=62.16, z=131.69], zv['item.tile.sapling.oak'/24, l='MpServer', x=168.25, y=63.00, z=142.88], zc['Squid'/25, l='MpServer', x=162.25, y=62.13, z=129.13], zv['item.tile.sapling.oak'/26, l='MpServer', x=171.47, y=63.00, z=143.69], yq['Cow'/27, l='MpServer', x=172.91, y=63.00, z=145.63], zv['item.item.apple'/28, l='MpServer', x=173.22, y=63.00, z=146.47], zv['item.tile.sapling.oak'/29, l='MpServer', x=168.19, y=63.00, z=147.13], zv['item.item.apple'/30, l='MpServer', x=170.13, y=63.00, z=150.59], zv['item.item.apple'/31, l='MpServer', x=169.91, y=63.00, z=148.16], yq['Cow'/32, l='MpServer', x=169.09, y=63.00, z=155.09], zv['item.tile.sapling.oak'/33, l='MpServer', x=172.13, y=66.00, z=149.13], zv['item.tile.sapling.oak'/34, l='MpServer', x=169.38, y=67.00, z=147.59], zv['item.tile.sapling.oak'/35, l='MpServer', x=168.88, y=63.00, z=146.13], yn['Bat'/38, l='MpServer', x=175.84, y=50.16, z=79.06], yn['Bat'/39, l='MpServer', x=183.75, y=49.13, z=77.00], zc['Squid'/41, l='MpServer', x=184.34, y=62.09, z=100.13], yq['Cow'/42, l='MpServer', x=176.69, y=63.00, z=124.25], yq['Cow'/43, l='MpServer', x=191.09, y=63.00, z=141.09], yq['Cow'/44, l='MpServer', x=190.44, y=63.00, z=127.44], zv['item.tile.mushroom'/45, l='MpServer', x=182.88, y=66.00, z=130.13], yq['Cow'/46, l='MpServer', x=188.03, y=64.00, z=158.13], zv['item.tile.sapling.oak'/47, l='MpServer', x=185.84, y=64.00, z=150.13], yq['Cow'/48, l='MpServer', x=187.75, y=63.00, z=178.78], yn['Bat'/49, l='MpServer', x=183.75, y=20.10, z=196.31], zc['Squid'/57, l='MpServer', x=197.50, y=56.75, z=99.09], zc['Squid'/58, l='MpServer', x=202.50, y=60.00, z=108.50], yq['Cow'/59, l='MpServer', x=197.78, y=63.00, z=138.09], yq['Cow'/60, l='MpServer', x=200.13, y=63.00, z=153.91], yq['Cow'/61, l='MpServer', x=205.13, y=64.00, z=154.19], yq['Cow'/62, l='MpServer', x=203.25, y=64.00, z=146.69], yq['Cow'/63, l='MpServer', x=200.13, y=64.00, z=161.13], yq['Cow'/65, l='MpServer', x=216.72, y=64.00, z=149.63], yq['Cow'/66, l='MpServer', x=218.78, y=64.00, z=174.69], yq['Cow'/67, l='MpServer', x=213.91, y=64.00, z=173.03], yq['Cow'/68, l='MpServer', x=216.81, y=64.00, z=191.19], zv['item.tile.gravel'/69, l='MpServer', x=208.75, y=30.00, z=206.88], yn['Bat'/74, l='MpServer', x=223.09, y=30.10, z=153.59], yq['Cow'/75, l='MpServer', x=230.66, y=63.00, z=146.88], yq['Cow'/76, l='MpServer', x=233.28, y=63.00, z=148.91], yq['Cow'/77, l='MpServer', x=234.88, y=63.00, z=145.88], yq['Cow'/78, l='MpServer', x=237.88, y=64.00, z=155.06], yn['Bat'/79, l='MpServer', x=219.81, y=25.94, z=160.25], yn['Bat'/80, l='MpServer', x=234.28, y=14.10, z=180.56], yq['Cow'/88, l='MpServer', x=257.78, y=63.00, z=115.19], yq['Cow'/89, l='MpServer', x=256.16, y=63.00, z=116.81], zv['item.tile.sapling.oak'/95846, l='MpServer', x=169.38, y=66.00, z=145.22], zv['item.tile.sapling.oak'/132842, l='MpServer', x=173.88, y=63.00, z=145.00], cbw['bbscraft'/113, l='MpServer', x=183.54, y=64.25, z=148.49]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bxy.a(SourceFile:310)
at blh.b(SourceFile:2133)
at blh.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:121)

– System Details –
Details:
Minecraft Version: 14w25a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 210673064 bytes (200 MB) / 350224384 bytes (334 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: 14w25a
LWJGL: 2.9.1
OpenGL: GeForce GT 630/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: [BackToBasics]
Current Language: English (UK)
Profiler Position: N/A (disabled)
whilst I was playing in a world created on the 14w25a snapshot. this occured in a swamp biome whilst i was chopping down a tree, I placed a log and then it crashed. I have done this several times and each time it crashed as i placed the block.