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Negative development rate when training overhead gets large

When dialing up the training-overhead-proportion I started getting the following exception:

. . .
  File "/Users/sixtynorth/.virtualenvs/bark_spider/lib/python3.5/site-packages/brooks-1-py3.5.egg/brooks/simulation.py", line 35, in simulate
    state = step(step_number, elapsed_time, state)
  File "/Users/sixtynorth/.virtualenvs/bark_spider/lib/python3.5/site-packages/brooks-1-py3.5.egg/brooks/brooks_law.py", line 41, in step
    * state.step_duration_days)
  File "/Users/sixtynorth/.virtualenvs/bark_spider/lib/python3.5/site-packages/brooks-1-py3.5.egg/brooks/state.py", line 165, in software_development_rate
    raise ValueError("Software development rate {0} cannot be negative".format(value))
ValueError: Software development rate -0.052767726246103534 cannot be negative

I get this with the following parameters:

State(step_duration_days=1, num_functions_points_requirements=500.00, num_functions_points_developed=0.00, num_new_personnel=20.00, num_experienced_personnel=0.00, personnel_alloca
tion_rate=0.00, personnel_assimilation_rate=0.00, assimilation_delay_days=20, nominal_productivity=0.1, new_productivity_weight=0.8, experienced_productivity_weight=1.2, software_d
evelopment_rate=None,cumulative_person_days=0,training_overhead_proportion=0.75,)

and the addition of 10 developers at 100 days.

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