CiviCRM 5.41.0 - WSOD crash with error PHP message: PHP Fatal error: Uncaught Error: Class 'CRM_Contact_Form_Search_Custom_Base

When updating to CiviCRM 5.41.0. Site crashes (WSOD) with error, PHP message: PHP Fatal error: Uncaught Error: Class 'CRM_Contact_Form_Search_Custom_Base.

This is due to the CRM_Contact_Form_Search_Custom_Base class being moved to the legacycustomsearches (core distributed) extension which is not enabled.

A CiviCRM site which has any of the following extensions installed (this is not an exhaustive list) would be impacted:

• nz.co.fuzion.historicmembershipdata
• uk.co.vedaconsulting.gdpr
• org.civicoop.recurringcontributionsearch
• org.civicoop.dataprocessor

Any extension that extends CRM_Contact_Form_Search_Custom_Base would be impacted by this issue.

Workaround

The workaround for this issue would be:

1. Before the upgrade
2. Disable each of the extensions that extends CRM_Contact_Form_Search_Custom_Base
3. Perform the upgrade
4. Enable the legacycustomsearches extension
5. Re-enable each of the extensions that extends CRM_Contact_Form_Search_Custom_Base

Agileware Ref: CIVIBLD-275