RuntimeError: Concurrent access to R is not allowed.

[Fclem]

View details in Rollbar: https://rollbar.com/fclem/Breeze/items/336/

Traceback (most recent call last):
  File "/homes/breeze/code/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/homes/breeze/code/venv/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 20, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/homes/breeze/code/isbio/breeze/views.py", line 692, in ajax_patients_data
    data_tbl = rora.get_patients_info(params, str(which))
  File "/homes/breeze/code/isbio/breeze/rora.py", line 137, in get_patients_info
    args=(subject, start, span, sort_col, sort_dir, search_value))
  File "/homes/breeze/code/isbio/breeze/rora.py", line 408, in global_r_call
    data = r_getter_func(*args)
  File "/homes/breeze/code/venv/local/lib/python2.7/site-packages/rpy2/robjects/functions.py", line 86, in __call__
    return super(SignatureTranslatedFunction, self).__call__(*args, **kwargs)
  File "/homes/breeze/code/venv/local/lib/python2.7/site-packages/rpy2/robjects/functions.py", line 31, in __call__
    new_args = [conversion.py2ri(a) for a in args]
  File "/homes/breeze/code/venv/local/lib/python2.7/site-packages/rpy2/robjects/__init__.py", line 136, in default_py2ri
    res = rinterface.SexpVector([o, ], rinterface.INTSXP)
RuntimeError: Concurrent access to R is not allowed.