This happens when the SharePoint Designer Workflow uses the "Send An Email" action which refers to the email recipients from a list item site column.
This issue will occur when the site column containing the recipient email-id/name is BLANK or NULL.
ResolutionMake sure you handle the scenario when the list of email recipients is blank.
The best way to troubleshoot this kind of error is to check the flow of your workflow step by step. Write logs at every stage to check at which point the issue is happening and work on that line once identified.
This is not an AI-generated article but is demonstrated by a human.
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