Random crash after flying around in a new world to test performance.

Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 23/07/14 18:32
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:254)
at cjs.b(SourceFile:111)
at cjs.a(SourceFile:45)
at cjs.a(SourceFile:35)
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:254)
at cjs.b(SourceFile:111)

– Block model being tesselated –
Details:
Block: minecraft:tallgrass[type=tall_grass]
Block location: World: (98,71,-43), Chunk: (at 2,4,5 in 6,-3; contains blocks 96,0,-48 to 111,255,-33), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Using AO: false
Stacktrace:
at cjs.a(SourceFile:45)
at cjs.a(SourceFile:35)

– Block being tesselated –
Details:
Block type: ID #31 (tile.tallgrass // azz)
Block data value: 1 / 0x1 / 0b0001
Block location: World: (98,71,-43), Chunk: (at 2,4,5 in 6,-3; contains blocks 96,0,-48 to 111,255,-33), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w30b
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 314622424 bytes (300 MB) / 634912768 bytes (605 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: 12, tallocated: 94