Unable to start services in background with circus 0.17.1

[rominf]

I use circus as a library to run service in background, and get an error:

from circus import get_arbiter

arbiter = get_arbiter([{"cmd": "sleep 1"}], background=True)
arbiter.start()

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/home/rominf/.pyenv/versions/3.7.9/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/home/rominf/.pyenv/versions/3.7.9/envs/circus-bug/lib/python3.7/site-packages/circus/arbiter.py", line 826, in run
    return Arbiter.start(self)
  File "/home/rominf/.pyenv/versions/3.7.9/envs/circus-bug/lib/python3.7/site-packages/tornado/gen.py", line 189, in wrapper
    future = _create_future()
  File "/home/rominf/.pyenv/versions/3.7.9/envs/circus-bug/lib/python3.7/site-packages/tornado/gen.py", line 142, in _create_future
    future = Future()  # type: Future
  File "/home/rominf/.pyenv/versions/3.7.9/lib/python3.7/asyncio/events.py", line 644, in get_event_loop
    % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'Thread-1'.

The same code runs without errors with circus 0.16.1.