When loading up the world "Void" on the new superflat preset, on survival the world loads up fine with a nice square of stone with cobblestone on the edge. But when you jump off, Your Game Crashes...

CRASH REPORT:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 9/10/15 5:27 PM
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: -1
at aqz.a(SourceFile:552)
at bap.b(SourceFile:152)
at bap.a(SourceFile:70)
at bap.a(SourceFile:53)
at bah.a(SourceFile:217)
at bkp.a(SourceFile:1036)
at azx.as(SourceFile:954)
at azx.a(SourceFile:377)
at net.minecraft.client.main.Main.main(SourceFile:125)

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

– Head –
Stacktrace:
at aqz.a(SourceFile:552)
at bap.b(SourceFile:152)
at bap.a(SourceFile:70)
at bap.a(SourceFile:53)
at bah.a(SourceFile:217)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bkc['Komm_'/0, l='MpServer', x=311.07, y=-0.06, z=803.77]]
Chunk stats: MultiplayerChunkCache: 288, 288
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (328,4,796), Chunk: (at 8,0,12 in 20,49; contains blocks 320,0,784 to 335,255,799), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Level time: 579 game time, 579 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: 1 total; [bkc['Komm_'/0, l='MpServer', x=311.07, y=-0.06, z=803.77]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bid.a(SourceFile:366)
at azx.b(SourceFile:2369)
at azx.a(SourceFile:391)
at net.minecraft.client.main.Main.main(SourceFile:125)

– System Details –
Details:
Minecraft Version: 15w37a
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 194212664 bytes (185 MB) / 287203328 bytes (273 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 15w37a
LWJGL: 2.9.4
OpenGL: GeForce GTX 760/PCIe/SSE2 GL version 4.5.0 NVIDIA 355.60, 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.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (UK)
Profiler Position: N/A (disabled)
CPU: 6x AMD FX(tm)-6350 Six-Core Processor