ValueError: math domain error

[busla]

I got this error in one of my simulations but couldn't grab the values from the traceback. I'll start logging the output and report back.

Traceback (most recent call last):
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask_cors/extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask_cors/extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/levy/code/voting/venv/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/levy/code/voting/backend/web.py", line 194, in check_simulation
    "results": simulation.get_results_dict()
  File "/home/levy/code/voting/backend/simulate.py", line 526, in get_results_dict
    self.analysis()
  File "/home/levy/code/voting/backend/simulate.py", line 505, in analysis
    self.analyze_list(ruleset, measure, c, p)
  File "/home/levy/code/voting/backend/simulate.py", line 280, in analyze_list
    std = sqrt(var)
ValueError: math domain error