What redstone means by that is that this bug should be fixed either when the Combat update comes out or when the next snapshot comes out.
That still hasn't fixed the problem.
Most likely the client ran out of memory. As [Mod] CubeTheThird stated, for Mojang to be able to diagnose the problem, you must have a crash report present.
What redstone means by that is that this bug should be fixed either when the Combat update comes out or when the next snapshot comes out.