I was playing around with the new armor and mob AI and tried to make a contraption so when i get down to half a heart or so it heals me so i can continue testing without pause to heal and i gave myself a command block and clicked it and nothing happened
EDIT: After relogging i got the command block to open but i broke it and placed it again and it crashed the game
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Cannot reproduce, please provide more detailed steps.
Please provide crash log so we can proceed.

This is the crash i got after replacing the command block, although after the crash things work fine
Confirmed, happens after death.
confirmed
confirmed for 15w36c as well
Confirmed for 15w36c
Confirmed for 15w36d
Confirmed to still be in
15w36d.
Steps:
Place a command block (No need to enter a command. All three varieties work.)
Die by either command, or by going into survival and dying naturally.
Try to open command block. (Even in creative mode, it won't work.)
Fail miserably.
Proceed to hate bugs.
I could not reproduce the crash, but the bug is there. 15w36d.
Nice of you to provide steps but the bug was already marked as fixed 🙂
It's not fixed! Confirmed on 15w36d! How can you claim it's fixed when it's so easily reproducible?
Check the fix version, it says "Future version: 1.9+".
if you exit the world and go back in it should work
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.