Video: https://www.youtube.com/watch?v=meP5qQbQp7w

Edit: it already crashes by placing redstone on the ground

Someone please confirm.

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 12/3/15 6:04 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

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

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['purefmwc'/232, l='MpServer', x=32.27, y=71.00, z=181.17]]
Chunk stats: MultiplayerChunkCache: 625, 625
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (256,64,244), Chunk: (at 0,4,4 in 16,15; contains blocks 256,0,240 to 271,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2900133 game time, 74390 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: 34 total; [bmg['purefmwc'/232, l='MpServer', x=32.27, y=71.00, z=181.17], vz['Rabbit'/3, l='MpServer', x=82.47, y=64.06, z=113.27], vq['Bat'/4, l='MpServer', x=67.34, y=54.92, z=185.78], wa['Sheep'/278, l='MpServer', x=-47.88, y=88.00, z=110.53], vq['Bat'/5, l='MpServer', x=67.68, y=54.02, z=187.59], vz['Rabbit'/7, l='MpServer', x=89.41, y=64.00, z=127.00], wa['Sheep'/283, l='MpServer', x=-40.63, y=92.00, z=144.09], vz['Rabbit'/282, l='MpServer', x=-46.75, y=92.00, z=115.34], wa['Sheep'/281, l='MpServer', x=-47.28, y=91.00, z=114.28], vz['Rabbit'/11, l='MpServer', x=111.44, y=64.00, z=103.31], wa['Sheep'/280, l='MpServer', x=-46.81, y=88.00, z=107.94], vz['Rabbit'/12, l='MpServer', x=101.59, y=64.00, z=109.88], vz['Rabbit'/13, l='MpServer', x=105.47, y=64.00, z=123.75], wa['Sheep'/285, l='MpServer', x=-32.88, y=63.00, z=231.00], vq['Bat'/284, l='MpServer', x=-32.86, y=24.34, z=203.81], vq['Bat'/320, l='MpServer', x=60.04, y=31.05, z=232.02], vq['Bat'/321, l='MpServer', x=56.50, y=40.10, z=219.75], wa['Sheep'/266, l='MpServer', x=-46.25, y=90.00, z=111.50], vq['Bat'/308, l='MpServer', x=20.09, y=63.10, z=158.66], vq['Bat'/311, l='MpServer', x=40.11, y=22.14, z=226.52], xz['item.tile.stonebrick'/233, l='MpServer', x=33.19, y=74.50, z=179.13], wc['Squid'/317, l='MpServer', x=56.05, y=59.03, z=170.44], wc['Squid'/316, l='MpServer', x=56.22, y=61.13, z=156.41], vq['Bat'/319, l='MpServer', x=58.84, y=38.10, z=219.16], wc['Squid'/318, l='MpServer', x=53.60, y=56.00, z=195.23], vq['Bat'/290, l='MpServer', x=-18.09, y=30.01, z=199.67], vq['Bat'/291, l='MpServer', x=-13.35, y=34.03, z=199.59], vq['Bat'/296, l='MpServer', x=-0.25, y=15.00, z=115.96], vq['Bat'/297, l='MpServer', x=-7.82, y=13.22, z=123.72], vq['Bat'/298, l='MpServer', x=-6.32, y=14.17, z=129.39], vq['Bat'/299, l='MpServer', x=0.86, y=49.02, z=249.32], vq['Bat'/301, l='MpServer', x=12.79, y=20.50, z=106.26], vz['Rabbit'/302, l='MpServer', x=14.59, y=74.00, z=119.59], wa['Sheep'/303, l='MpServer', x=13.38, y=74.00, z=172.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)