Ошибка при работе с группой

[Deleted user]

2017-05-04T18:49:18.706514+00:00 app[worker.1]: Traceback (most recent call last):
2017-05-04T18:49:18.706501+00:00 app[worker.1]: Task exception was never retrieved
2017-05-04T18:49:18.706513+00:00 app[worker.1]: future: <Task finished coro=<Bot.handle_queues() done, defined at vbot.py:84> exception=TypeError("'NoneType' object is not callable",)>
2017-05-04T18:49:18.706517+00:00 app[worker.1]:     result = await self.vk.method("execute", {"code": execute}, queue == self.queue_user)
2017-05-04T18:49:18.706515+00:00 app[worker.1]:   File "vbot.py", line 86, in handle_queues
2017-05-04T18:49:18.706516+00:00 app[worker.1]:     if await self.process_queue(self.queue_user):
2017-05-04T18:49:18.706516+00:00 app[worker.1]:   File "vbot.py", line 115, in process_queue
2017-05-04T18:49:18.706518+00:00 app[worker.1]:   File "/app/vkplus.py", line 255, in method
2017-05-04T18:49:18.706519+00:00 app[worker.1]:     return unquote(await api_method(key, **data))
2017-05-04T18:49:18.706524+00:00 app[worker.1]: TypeError: 'NoneType' object is not callable