SharePoint Designer List type workflow 2013 stopped sending emails in SharePoint Online

Copper Contributor

Hi Guys,

The list type workflow 2013 stopped sending emails suddenly. What could be the possible issue, It throws the following error:
Retrying last request. Next attempt scheduled in less than one minute. Details of last request: HTTP BadRequest to
mydomain/sharepoint.com/sites/sitename/_api/sp.utilities.utility.SendEmail Correlation Id: Guid Instance Id: Guid
Value cannot be null.
Parameter name: address

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