AttributeError: 'AnonymousUser' object has no attribute '_meta'

[sentry]

Sentry Issue: ONADATA-GBP

AttributeError: 'AnonymousUser' object has no attribute '_meta'
(13 additional frame(s) were not displayed)
...
  File "onadata/apps/api/viewsets/xform_viewset.py", line 1144, in export_async
    resp = process_async_export(request, xform, export_type, options)
  File "onadata/libs/utils/api_export_tools.py", line 496, in process_async_export
    "job_uuid": create_export_async(
  File "onadata/libs/utils/api_export_tools.py", line 551, in create_export_async
    send_message(
  File "onadata/apps/messaging/serializers.py", line 184, in send_message
    message.save()
  File "onadata/apps/messaging/serializers.py", line 111, in create
    results = action.send(

[linear]

ONADATA-1410