Ticket #35428: ms-functions.php.patch

wp-includes/ms-functions.php

@@ -982 +982 @@
         if ( empty($signup->domain) ) {
                 $wpdb->update( $wpdb->signups, array('active' => 1, 'activated' => $now), array('activation_key' => $key) );
 
-                if ( isset( $user_already_exists ) )
-                        return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup);
+                if ( isset( $user_already_exists ) ){
+                        /**
+                         * allow the suppression of errors if user already exists.
+                         *
+                         * @since 4.5
+                         *
+                         * @param WP_Error
+                         */
+                        return apply_filters('_wpmu_activate_existing_error_', new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup ), get_defined_vars() );
 
+                }
+
                 /**
                  * Fires immediately after a new user is activated.
                  *