Squid damage multiplayer - End of Stream, NullPointerException

I was on a locally hosted multiplayer server, and i hit a squid then get a End of stream message and the console log shows this

ERROR ec Exception on tcp connection java.lang.NullPointerException
at gw.a(SourceFile:228)
at gm.a(SourceFile:49)
at gw.a(SourceFile:219)
at ec.i(SourceFile:179)
at ec.d(SourceFile:19)
at ee.run(SourceFile:117)

here is Docm77's snapshot video showing this bug
http://youtu.be/pz7Iu7L1ZiQ?t=6m30s

i have tested this on single player and did not crash/get kicked