Troubleshooting an Email Marketer Rule Repeating Emails
After applying the 7.10.1 update, the Email Marketer tool may send repeated copies of an email.
The Email Marketer underlying code and logic was re-factored in 7.10. Additional logic is required to account for an unbound query for date criteria in the automation task.
Please apply the 7.10.2 Maintenance Release via the Utilities > Update WHMCS page.
A hotfix has been created for 7.10.1 only which will resolve the cause of this error: