Random crash...

Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 67, Size: 46
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at aau.a(SourceFile:300)
	at bkt.a(SourceFile:415)
	at bft.a(SourceFile:517)
	at bft.b(SourceFile:541)
	at bft.a(SourceFile:526)
	at bfb.l(SourceFile:420)
	at bfb.p(SourceFile:387)
	at bcf.t(SourceFile:1575)
	at bcf.av(SourceFile:962)
	at bcf.a(SourceFile:392)
	at net.minecraft.client.main.Main.main(SourceFile:124)