diff --git a/TDNL/TDNL.sql b/TDNL/TDNL.sql
index 6a01b35f5..f99ed3b30 100644
--- a/TDNL/TDNL.sql
+++ b/TDNL/TDNL.sql
@@ -1216,7 +1216,7 @@ BEGIN
 					SELECT prs_perslid_key
 					  INTO v_prs_perslid_key
 					  FROM prs_perslid p
-					 WHERE p.prs_perslid_oslogin=rec.prs_perslid_oslogin;
+					 WHERE p.prs_perslid_oslogin=COALESCE(rec.prs_perslid_oslogin,'_MIGRATIE');
 			EXCEPTION
 			WHEN NO_DATA_FOUND
 			THEN