python - "Sometimes" getting an InterfaceError on PostgreSQL with Peewee ORM -

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i'm building website using python flask framework , peewee orm postgresql 9.3. far things going pretty well, run trouble. interfaceerror: connection closed. code on follows:

pendingorders_q = customerorder\     .select()\     .where(customerorder.status == customerorder.status_pending)\     .where(customerorder.expiration < datetime.utcnow())  if len(list(pendingorders_q)) > 0:     # stuff here..

i know way of counting number of results pretty nasty, don't know other ways of doing it. also, works, gives error below. don't understand why works fine, gives error. know whats going on here?

  file "/home/kramer65/xs/app/order_management.py", line 210, in checkexpiration     if len(list(pendingorders_q)) > 0:   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 1988, in __iter__     return iter(self.execute())   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 1981, in execute     self._qr = resultwrapper(model_class, self._execute(), query_meta)   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 1698, in _execute     return self.database.execute_sql(sql, params, self.require_commit)   file "/usr/local/lib/python2.7/dist-packages/playhouse/postgres_ext.py", line 251, in execute_sql     self.commit()   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 2104, in __exit__     reraise(new_type, new_type(*exc_value.args), traceback)   file "/usr/local/lib/python2.7/dist-packages/playhouse/postgres_ext.py", line 242, in execute_sql     cursor = self.get_cursor()   file "/usr/local/lib/python2.7/dist-packages/playhouse/postgres_ext.py", line 229, in get_cursor     return self.get_conn().cursor(name=name) interfaceerror: connection closed

[edit] following error line:

traceback (most recent call last):   file "/usr/local/lib/python2.7/dist-packages/apscheduler/scheduler.py", line 512, in _run_job     retval = job.func(*job.args, **job.kwargs)   file "/home/kramer65/xs/app/order_management.py", line 207, in checkfordetails     order in paidinorders_q:   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 1411, in next     obj = self.iterate()   file "/usr/local/lib/python2.7/dist-packages/peewee.py", line 1392, in iterate     row = self.cursor.fetchone() interfaceerror: cursor closed


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