ValueError: There's already an active RQ scheduler

[crwallace]

https://sentry.io/colorofchange/callpower-ug/issues/351460970/

ValueError: There's already an active RQ scheduler
(2 additional frame(s) were not displayed)
...
  File "flask_script/__init__.py", line 383, in handle
    res = handle(*args, **config)
  File "flask_rq2/script.py", line 42, in __call__
    return self.run(*args, **kwargs)
  File "flask_rq2/script.py", line 233, in run
    scheduler.run()
  File "rq_scheduler/scheduler.py", line 336, in run
    self.register_birth()
  File "rq_scheduler/scheduler.py", line 33, in register_birth
    raise ValueError("There's already an active RQ scheduler")

ValueError: There's already an active RQ scheduler