Script seems to bomb when there's a root device

[jaxxstorm]

2016-08-16 02:35:12 [DEBUG] [distami.utils(44):get_ami] Found AMIs: [Image:ami-3616dc56]
Traceback (most recent call last):
  File "/usr/local/bin/distami", line 9, in <module>
    load_entry_point('distami==1.0.7', 'console_scripts', 'distami')()
  File "/Library/Python/2.7/site-packages/distami/cli.py", line 100, in run
    distami = Distami(args.ami_id, ami_region)
  File "/Library/Python/2.7/site-packages/distami/core.py", line 48, in __init__
    bdm = self._image.block_device_mapping[ami.root_device_name]
KeyError: u'/dev/sda1'