Parallel excecution self.patterns.parallel.invoke

Hi,

I try to use self.patterns.parallel.invoke but i always get an error

2019-12-20 09:10:36,924 - ERROR - 63168:DummyThread-145 - zato:57 - Could not handle broker msg:`Bunch(action=u'101802', callback=None, channel=u'parallel-exec-call', cid=u'eabe40b9ae0184a1a88294d4', data_format=u'dict', environ={}, is_async=True, msg_type=u'0001', payload=u'{"data": "from-parallel-exec1"}', service=u'test', transport=None, zato_ctx={u'parallel_exec_cid': u'fe0e7a3324920ce9b247d07c'})`, e:`Traceback (most recent call last):
  File "/opt/zato/zato/code/zato-broker/src/zato/broker/__init__.py", line 52, in on_broker_msg
    getattr(self, handler)(msg)
  File "/opt/zato/zato/code/zato-server/src/zato/server/base/worker/__init__.py", line 1865, in on_broker_msg_SERVICE_PUBLISH
    return self.on_message_invoke_service(msg, msg.get('channel') or CHANNEL.INVOKE_ASYNC, 'SERVICE_PUBLISH', args)
  File "/opt/zato/zato/code/zato-server/src/zato/server/base/worker/__init__.py", line 1550, in on_message_invoke_service
    environ=msg.get('environ'))
  File "/opt/zato/zato/code/zato-server/src/zato/server/service/__init__.py", line 589, in update_handle
    wmq_ctx=kwargs.get('wmq_ctx'))
  File "/opt/zato/zato/code/zato-server/src/zato/server/service/__init__.py", line 1125, in update
    channel_item.get('id'), channel_item.get('name'), channel_type,
AttributeError: 'NoneType' object has no attribute 'get'

Can anyone help me please?