Game Crash for no Apparent Reason

Minecraft Crash Report ----
// Why is it breaking 😞

Time: 7/23/14 10:34 PM
Description: Tesselating block in world

java.lang.NullPointerException: Tesselating block in world
at chc.b(SourceFile:303)
at chc.a(SourceFile:281)
at cjr.a(SourceFile:118)
at cjq.a(SourceFile:67)
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:
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– Head –
Stacktrace:
at chc.b(SourceFile:303)
at chc.a(SourceFile:281)
at cjr.a(SourceFile:118)

– Block being tesselated –
Details:
Block type: ID #11 (tile.lava // azp)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (-264,31,76), Chunk: (at 8,1,12 in -17,4; contains blocks -272,0,64 to -257,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
at cjq.a(SourceFile:67)
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: 218411640 bytes (208 MB) / 953679872 bytes (909 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