Error while running under python 3.4 #8

$ fig run console bash
Traceback (most recent call last):
  File "...fig/.tox/py34/lib/python3.4/site-packages/dockerpty/pty.py", line 143, in start
    flags = [io.set_blocking(p, False) for p in pumps]
  File "...fig/.tox/py34/lib/python3.4/site-packages/dockerpty/pty.py", line 143, in <listcomp>
    flags = [io.set_blocking(p, False) for p in pumps]
  File "...fig/.tox/py34/lib/python3.4/site-packages/dockerpty/io.py", line 31, in set_blocking
    old_flag = fcntl.fcntl(fd, fcntl.F_GETFL)
ValueError: file descriptor cannot be a negative integer (-1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "...fig/.tox/py34/bin/fig", line 9, in <module>
    load_entry_point('fig==0.5.2', 'console_scripts', 'fig')()
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/main.py", line 30, in main
    command.sys_dispatch()
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/docopt_command.py", line 21, in sys_dispatch
    self.dispatch(sys.argv[1:], None)
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/command.py", line 28, in dispatch
    super(Command, self).dispatch(*args, **kwargs)
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/docopt_command.py", line 24, in dispatch
    self.perform_command(*self.parse(argv, global_options))
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/command.py", line 49, in perform_command
    handler(project, command_options)
  File "...fig/.tox/py34/lib/python3.4/site-packages/fig/cli/main.py", line 263, in run
    dockerpty.start(project.client, container.id)
  File "...fig/.tox/py34/lib/python3.4/site-packages/dockerpty/__init__.py", line 27, in start
    PseudoTerminal(client, container).start()
  File "...fig/.tox/py34/lib/python3.4/site-packages/dockerpty/pty.py", line 147, in start
    if flags:
UnboundLocalError: local variable 'flags' referenced before assignment

pumps:

stdin: (Stream(<_io.TextIOWrapper name='<stdin>' mode='r' encoding='UTF-8'>), Stream(<socket.socket [closed] fd=-1, family=AddressFamily.AF_UNIX, type=SocketType.SOCK_STREAM, proto=0>)), 

stdout: (Stream(<socket.socket [closed] fd=-1, family=AddressFamily.AF_UNIX, type=SocketType.SOCK_STREAM, proto=0>), Stream(<_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>)), 

stderr: (Stream(<socket.socket [closed] fd=-1, family=AddressFamily.AF_UNIX, type=SocketType.SOCK_STREAM, proto=0>), Stream(<_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>))