Ticket #7697: 7697.01.patch

src/bp-core/bp-core-filters.php

@@ -1008 +1008 @@
         if ( ! empty( $tokens['unsubscribe'] ) && $tokens['unsubscribe'] !== wp_login_url() ) {
                 $user = get_user_by( 'email', $tokens['recipient.email'] );
 
-                $headers['List-Unsubscribe'] = sprintf(
-                        '<%s>',
-                        esc_url_raw( bp_email_get_unsubscribe_link( array(
-                                'user_id'           => $user->ID,
-                                'notification_type' => $email->get( 'type' ),
-                        ) ) )
-                );
+                $link = bp_email_get_unsubscribe_link( array(
+                        'user_id'           => $user->ID,
+                        'notification_type' => $email->get( 'type' ),
+                ) );
+
+                if ( ! empty( $link ) ) {
+                        $headers['List-Unsubscribe'] = sprintf( '<%s>', esc_url_raw( $link ) );
+                }
         }
 
         return $headers;