Not sure why but anytime I try to use the newest version of the chain explorer with a proof of stake coin I get this when browsing any block


Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/home/*/Downloads/bitcoin-abe/Abe/abe.py", line 250, in __call__
    handler(page)
  File "/home/*/Downloads/bitcoin-abe/Abe/abe.py", line 673, in handle_block
    abe._show_block(page, '', None, block_hash=block_hash)
  File "/home/*/Downloads/bitcoin-abe/Abe/abe.py", line 564, in _show_block
    is_stake_block = is_stake_chain and b['is_proof_of_stake']
KeyError: 'is_proof_of_stake'


I've tried faircoin and community coin, I use policy NovaCoin, it seems to load all the blocks but when browsing any block I get the above error, when accessing addresses and transaction everything works fine.