[web2py] session in redis

[rif]

Is the code bellow the correct way to create the sessions in redis?

from gluon.contrib.memdb import MEMDB
from gluon.contrib.redis_cache import RedisCache
cache.redis = RedisCache('localhost:6379',db=None, debug=True)
session.connect(request, response, db = MEMDB(cache.redis))

If yes, there is an error:

ERROR:web2py:Traceback (most recent call last):
  File "/home/rif/Documents/webframeworks/web2py/gluon/main.py", line 614, 
in wsgibase
    BaseAdapter.close_all_instances('rollback')
  File "/home/rif/Documents/webframeworks/web2py/gluon/dal.py", line 529, 
in close_all_instances
    THREAD_LOCAL.db_instances.clear()
AttributeError: 'thread._local' object has no attribute 'db_instances'

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