list index out of range Exception

[woodsaj]

seeing lots of these in the logs.

2016-04-26 07:10:02 ERROR    flask.app       {"event": "Exception on /render [GET]", "exception": "Traceback (most recent call last):
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/flask/app.py\", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/flask/app.py\", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/flask/app.py\", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/flask/app.py\", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/flask/app.py\", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/graphite_api/app.py\", line 384, in render
    data_store = fetchData(context, paths)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/graphite_api/render/datalib.py\", line 160, in fetchData
    time_info, series = finder.fetch_multi(nodes, startTime, endTime)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/graphite_raintank.py\", line 186, in fetch_multi
    data = self.fetch_from_tank(nodes, start_time, end_time)
  File \"/usr/share/python/graphite/local/lib/python2.7/site-packages/graphite_raintank.py\", line 254, in fetch_from_tank
    if datapointList[pos][i][0] is not None:
IndexError: list index out of range"}