Location stream throws TwitterError #363

>>> for line in twitter_api.GetStreamFilter(locations=["2.1,41.1,2.3,41.5"]):
...     Print line
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/simon/Nightyspace/venv/lib/python2.7/site-packages/twitter/api.py", line 4430, in GetStreamFilter
    data = self._ParseAndCheckTwitter(line.decode('utf-8'))
  File "/Users/simon/Nightyspace/venv/lib/python2.7/site-packages/twitter/api.py", line 4696, in _ParseAndCheckTwitter
    raise TwitterError({'message': "json decoding"})
twitter.error.TwitterError: {'message': 'json decoding'}
>>>