Minecraft started crashing every 15 minutes or so repeatedly.

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 7/23/14 9:06 PM
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: -12
	at java.nio.DirectIntBufferU.get(Unknown Source)
	at chc.a(SourceFile:183)
	at cjs.a(SourceFile:149)
	at cjs.a(SourceFile:81)
	at cjs.a(SourceFile:43)
	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.nio.DirectIntBufferU.get(Unknown Source)
	at chc.a(SourceFile:183)
	at cjs.a(SourceFile:149)
	at cjs.a(SourceFile:81)

-- Block model being tesselated --
Details:
	Block: minecraft:leaves[check_decay=false,decayable=true,variant=oak]
	Block location: World: (357,70,612), Chunk: (at 5,4,4 in 22,38; contains blocks 352,0,608 to 367,255,623), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
	Using AO: true
Stacktrace:
	at cjs.a(SourceFile:43)
	at cjs.a(SourceFile:35)

-- Block being tesselated --
Details:
	Block type: ID #18 (tile.leaves // axj)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (357,70,612), Chunk: (at 5,4,4 in 22,38; contains blocks 352,0,608 to 367,255,623), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
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 8.1 (x86) version 6.3
	Java Version: 1.7.0_65, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 149951352 bytes (143 MB) / 488062976 bytes (465 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95