Crash when killing yourself with a bow in 14w02c

When you kill yourself by shoting arrows in the air above you, Minecraft crashes with the following crash report.
I tried tihs several times with different bows(some were enchanted) in a world which i created in 1.7.
When i tried the same thing in a new(in 14w02c) created world everything works fine.
I dont understand why this is happening... I restarted Minecraft, but in the old world it still crashed.