ValueError: NULL pointer access in stem.util.system.get_process_name()

Running integ tests causes -

ERROR: test_set_process_name
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Traceback:
  File "/Users/sathya/Documents/stem/test/integ/util/system.py", line 405, in test_set_process_name
    initial_name = stem.util.system.get_process_name()
  File "/Users/sathya/Documents/stem/stem/util/system.py", line 726, in get_process_name
    if argc[i] is None:
ValueError: NULL pointer access