Since upgrading to 5.9.0 (Drupal 7.6), we have noticed that all self-service / online event registrations are creating duplicate contacts - of both the individual end the organization (employer) record.

Having looked at the Unsupervised rule, it should absolutely be triggering - eg there are multiple contacts that have been created where the first name, last name, and email all exactly match an existing contact.

Our individual unsupervised rule is:

Screenshot of unsupervised de-dupe rule

Has anyone else seen this behaviour on their installation?


1 Answer 1


I am not sure if its somehow related to one of the regression for 5.9.0 for Anonymous user ACL permission which is fixed in 5.9.1. Would be worth trying after upgrading CiviCRM to 5.9.1 or applying patch from here!



  • Thanks! I've updated to 5.9.1 and will report back Jan 17, 2019 at 18:02
  • Sure let us know if it fixed your issue! Jan 21, 2019 at 23:46
  • Hi Pradeep, just been able to check (sorry for the delay) and the problem appears solved. Thank you! Jan 23, 2019 at 15:33

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