State request error during device are processing.

Error:
Remote Exception: Incorrect output. {'kind': 'reply', 'module': 'storage', 'action': 'get_state', 'data': {'uuid': '51056bfb-e844-46c6-99f5-3179c9d2e900', 'old_uuid': '', 'old_device_desc': '/dev/sdb', 'blocked': True, 'state': 'growing', 'raid': 'custom'}}

Extra:
{"module": "storage", "action": "get_state", "kind": "request"}

Trace:
Traceback (most recent call last): File "/message_router.py",
line 140, in process_message File "/message_router.py", 
line 40, in wrapper File "/message_router.py", 
line 76, in validate File "/validator.py", 
line 257, in validate File "/validators.py", 
line 348, in validate jsonschema.exceptions.ValidationError: '' is too short
Failed validating 'minLength' in schema['properties']['data']['properties']['old_uuid']: {'maxLength': 40, 'minLength': 5, 'type': 'string'}
On instance['data']['old_uuid']: ''