Modification of Thread Error

[Ken24]

Environment

• CentOS 7.2
• Docker 1.13
• Python 3.4.5

Error

[E 2017-02-25 09:28:04.243 JupyterHub app:1527]                     [1/599]
    Traceback (most recent call last):
      File "/usr/lib/python3.4/site-packages/jupyterhub/app.py", line 1524, in launch_instance_async
        yield self.initialize(argv)
      File "/usr/lib/python3.4/site-packages/jupyterhub/app.py", line 1315, in initialize
        yield self.init_spawners()
      File "/usr/lib/python3.4/site-packages/jupyterhub/app.py", line 1087, in init_spawners
        status = yield spawner.poll()
      File "/usr/lib/python3.4/site-packages/swarmspawner-0.1-py3.4.egg/cassinyspawner/swarmspawner.py", line 219, in poll
        service = yield self.get_service()
      File "/usr/lib/python3.4/site-packages/swarmspawner-0.1-py3.4.egg/cassinyspawner/swarmspawner.py", line 255, in get_service
        'inspect_service', self.service_name
      File "/usr/lib/python3.4/site-packages/swarmspawner-0.1-py3.4.egg/cassinyspawner/swarmspawner.py", line 214, in docker
        return self.executor.submit(self._docker, method, *args, **kwargs)
      File "/usr/lib64/python3.4/concurrent/futures/thread.py", line 105, in submit
        self._adjust_thread_count()
      File "/usr/lib64/python3.4/concurrent/futures/thread.py", line 116, in _adjust_thread_count
        if len(self._threads) < self._max_workers:
    TypeError: unorderable types: int() < NoneType()

[barrachri]

Thanks @Ken24