Crash after entering a world

Simply put, I opened a world(using the latest snapshot, 14w26c). I saw a skeleton in front of me, I tried to backtrack away from it, in hopes of not getting attacked(It's a brand new world, I have like 5 wood, a stone pickaxe and a stone axe). As I did so, my minecraft screen disappeared and the launcher opened, showing this error. This is the second time it's happened(using this world), so I decided to post it.

Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException: -1170176115
	at java.util.HashMap.getEntry(Unknown Source)
	at java.util.HashMap.get(Unknown Source)
	at vp.a(SourceFile:17)
	at vs.e(SourceFile:16)
	at vs.a(SourceFile:10)
	at uy.a(SourceFile:991)
	at vz.c(SourceFile:63)
	at uz.bA(SourceFile:463)
	at uy.f(SourceFile:1406)
	at uz.f(SourceFile:317)