`account.get_blance` fails with currency of "HIVE" but works for "STEEM"

I'm just trying out this version of Beem instead of the Github fork I've been using up to now.

account.get_balance("available", "HIVE")

That gives an error:

beem.exceptions.AssetDoesNotExistsException: HIVE chain_assets:[{'asset': '@@000000013', 'symbol': 'SBD', 'precision': 3, 'id': 0}, {'asset': '@@000000021', 'symbol': 'STEEM', 'precision': 3, 'id': 1}, {'asset': '@@000000037', 'symbol': 'VESTS', 'precision': 6, 'id': 2}]

While this works:

account.get_balance("available", "STEEM")

Up to now I've been using this fork of Beem (on my github):

https://github.com/brianoflondon/beem