Game crashes at random during LAN gameplay

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 7/23/14 5:48 PM
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:105)
	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:105)

-- Block model being tesselated --
Details:
	Block: minecraft:stone[variant=diorite]
	Block location: World: (65,68,46), Chunk: (at 1,4,14 in 4,2; contains blocks 64,0,32 to 79,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Using AO: false
Stacktrace:
	at cjs.a(SourceFile:45)
	at cjs.a(SourceFile:35)

-- Block being tesselated --
Details:
	Block type: ID #1 (tile.stone // azs)
	Block data value: 3 / 0x3 / 0b0011
	Block location: World: (65,68,46), Chunk: (at 1,4,14 in 4,2; contains blocks 64,0,32 to 79,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
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 (x86) version 6.1
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 70343448 bytes (67 MB) / 252125184 bytes (240 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