dask-gateway: `ssl_context` context error when connecting to existing cluster.

I am having issues when connecting to existing clusters in the gateway (0.6.0). When I run:

from dask_gateway import Gateway, BasicAuth

from dask.distributed import Client

gateway = Gateway(
    '<web-url>',
    proxy_address="'<scheduler-proxy>',",
    auth=BasicAuth("", "password")
)

cluster = gateway.new_cluster()
existing_cluster = gateway.connect(cluster.name)
client = Client(existing_cluster)

I get the following error:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-33-c12b00e8db36> in <module>
----> 1 client = Client(existing_cluster)

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/client.py in __init__(self, address, loop, timeout, set_as_default, scheduler_file, security, asynchronous, name, heartbeat_interval, serializers, deserializers, extensions, direct_to_workers, **kwargs)
    724             ext(self)
    725 
--> 726         self.start(timeout=timeout)
    727         Client._instances.add(self)
    728 

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/client.py in start(self, **kwargs)
    889             self._started = asyncio.ensure_future(self._start(**kwargs))
    890         else:
--> 891             sync(self.loop, self._start, **kwargs)
    892 
    893     def __await__(self):

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/utils.py in sync(loop, func, callback_timeout, *args, **kwargs)
    332     if error[0]:
    333         typ, exc, tb = error[0]
--> 334         raise exc.with_traceback(tb)
    335     else:
    336         return result[0]

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/utils.py in f()
    316             if callback_timeout is not None:
    317                 future = gen.with_timeout(timedelta(seconds=callback_timeout), future)
--> 318             result[0] = yield future
    319         except Exception as exc:
    320             error[0] = sys.exc_info()

/anaconda3/envs/py37/lib/python3.7/site-packages/tornado/gen.py in run(self)
    733 
    734                     try:
--> 735                         value = future.result()
    736                     except Exception:
    737                         exc_info = sys.exc_info()

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/client.py in _start(self, timeout, **kwargs)
    982 
    983         try:
--> 984             await self._ensure_connected(timeout=timeout)
    985         except OSError:
    986             await self._close()

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/client.py in _ensure_connected(self, timeout)
   1039                 self.scheduler.address,
   1040                 timeout=timeout,
-> 1041                 connection_args=self.connection_args,
   1042             )
   1043             comm.name = "Client->Scheduler"

/anaconda3/envs/py37/lib/python3.7/site-packages/distributed/comm/core.py in connect(addr, timeout, deserialize, connection_args)
    216                         timedelta(seconds=min(deadline - time(), 1)),
    217                         future,
--> 218                         quiet_exceptions=EnvironmentError,
    219                     )
    220                     break

/anaconda3/envs/py37/lib/python3.7/site-packages/dask_gateway/comm.py in connect(self, address, deserialize, **connection_args)
     39             raise TypeError(
     40                 "Gateway expects a `ssl_context` argument of type "
---> 41                 "ssl.SSLContext, instead got %s" % ctx
     42             )
     43 

TypeError: Gateway expects a `ssl_context` argument of type ssl.SSLContext, instead got None

Do anyone have advice for getting around this?