[tryton-dev] self.user is none?

[Demoy Blake]

I am making a script to import remote data then create patient records from 
data.
the scripts are working individually but called from a tryton wizard I 
receive these errors.
 
  File "/trytond/modules/aa/aa.py", line 110, in map_Mdata
    with Transaction().start(dbname, 0, context=CONTEXT):
  File "/trytond/transaction.py", line 70, in start
    assert self.user is None
AssertionError

here is line 110 in map_Mdata mentioned above

    dbname = 'admin'
    CONTEXT={}

    Pool.start()
    pool = Pool(dbname)
    Cache.clean(dbname)

    # Line 110
    with Transaction().start(dbname, 0, context=CONTEXT):
        pool.init()
        
    with Transaction().start(dbname, 0, context=CONTEXT):
        user_obj = pool.get('res.user')
        user = user_obj.search([('login', '=', 'admin')], limit=1)[0]
        user_id = user.id