diff --git a/tools/generate_candidate_externalids.php b/tools/generate_candidate_externalids.php
index 1f8682e09be..119f199fa56 100644
--- a/tools/generate_candidate_externalids.php
+++ b/tools/generate_candidate_externalids.php
@@ -67,7 +67,8 @@
 $cands = $DB->pselect(
     "SELECT CandID, ExternalID, RegistrationCenterID as site,
     RegistrationProjectID as project
-    FROM candidate",
+    FROM candidate
+    WHERE Entity_type<>'Scanner'",
     []
 );
 
@@ -78,8 +79,8 @@
         continue;
     }
 
-    $site    = \Site::singleton($cand['site']);
-    $project = \Project::getProjectFromID($cand['project']);
+    $site    = \Site::singleton(new \CenterID($cand['site']));
+    $project = \Project::getProjectFromID(new \ProjectID($cand['project']));
 
     $externalID = (new \ExternalIDGenerator(
         $site->getSiteAlias(),