World crash

When you teleport to x:20000 y:100 z:20000 and fly around world crashes and when you try to rejoin game you automatically disconnect and client crashes.

java.lang.StackOverflowError
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at adg.e(SourceFile:481)
	at adg.d(SourceFile:461)
	at agx.a(SourceFile:74)
	at kn.a(SourceFile:317)
	at kn.a(SourceFile:303)
	at agx.b(SourceFile:225)
	at alw.a(SourceFile:468)
	at adg.d(SourceFile:326)
	at ajs.n(SourceFile:27)
	at ajs.a(SourceFile:20)
	at adg.e(SourceFile:479)
	at adg.d(SourceFile:462)
Source block type: ID #8 (tile.water // agx)
	Block type: ID #9 (tile.water // ajs)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (20305,43,20037), Chunk: (at 1,2,5 in 1269,1252; contains blocks 20304,0,20032 to 20319,255,20047), Region: (39,39; contains chunks 1248,1248 to 1279,1279, blocks 19968,0,19968 to 20479,255,20479)
Source block type: ID #9 (tile.water // ajs)
	Block type: ID #9 (tile.water // ajs)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (20305,44,20037), Chunk: (at 1,2,5 in 1269,1252; contains blocks 20304,0,20032 to 20319,255,20047), Region: (39,39; contains chunks 1248,1248 to 1279,1279, blocks 19968,0,19968 to 20479,255,20479)
ource block type: ID #10 (tile.lava // agx)
	Block type: ID #11 (tile.lava // ajs)
	Block data value: 10 / 0xA / 0b1010
	Block location: World: (20305,46,20037), Chunk: (at 1,2,5 in 1269,1252; contains blocks 20304,0,20032 to 20319,255,20047), Region: (39,39; contains chunks 1248,1248 to 1279,1279, blocks 19968,0,19968 to 20479,255,20479)