traceback in alert system on M50 HA system

Running 11.3-U2 I received this traceback in the alert system

Failed to check for alert EnclosureStatus: Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/alert.py", line 660, in __run_source alerts = (await alert_source.check()) or [] File "/usr/local/lib/middlewared_truenas/alert/source/enclosure_status.py", line 37, in check for ele in sum([e['elements'] for e in enc['elements']], []): File "/usr/local/lib/middlewared_truenas/alert/source/enclosure_status.py", line 37, in for ele in sum([e['elements'] for e in enc['elements']], []): KeyError: 'elements'