diff --git a/db/routines/vn/triggers/workerTimeControl_afterDelete.sql b/db/routines/vn/triggers/workerTimeControl_afterDelete.sql
index 27432fccb..96db381b5 100644
--- a/db/routines/vn/triggers/workerTimeControl_afterDelete.sql
+++ b/db/routines/vn/triggers/workerTimeControl_afterDelete.sql
@@ -3,10 +3,12 @@ CREATE OR REPLACE DEFINER=`vn`@`localhost` TRIGGER `vn`.`workerTimeControl_after
 	AFTER DELETE ON `workerTimeControl`
 	FOR EACH ROW
 BEGIN
-	INSERT INTO workerLog
-		SET `action` = 'delete',
-			`changedModel` = 'WorkerTimeControl',
-			`changedModelId` = OLD.id,
-			`userFk` = account.myUser_getId();
+	IF account.myUser_getId() IS NOT NULL THEN
+		INSERT INTO workerLog
+			SET `action` = 'delete',
+				`changedModel` = 'WorkerTimeControl',
+				`changedModelId` = OLD.id,
+				`userFk` = account.myUser_getId();
+	END IF;
 END$$
 DELIMITER ;