diff --git a/db/routines/vn/triggers/ticket_beforeUpdate.sql b/db/routines/vn/triggers/ticket_beforeUpdate.sql
index 72831bc3d..34b6711ff 100644
--- a/db/routines/vn/triggers/ticket_beforeUpdate.sql
+++ b/db/routines/vn/triggers/ticket_beforeUpdate.sql
@@ -8,13 +8,16 @@ BEGIN
 	SET NEW.editorFk = account.myUser_getId();
 
 	IF NOT (NEW.routeFk <=> OLD.routeFk) THEN
-		INSERT IGNORE INTO `vn`.`routeRecalc` (`routeFk`)
-			SELECT r.id
-				FROM vn.route r
-				WHERE r.isOk = FALSE
-					AND r.id IN (OLD.routeFk,NEW.routeFk)
-					AND r.created >= util.VN_CURDATE()
-				GROUP BY r.id;
+		IF NEW.isSigned THEN
+			CALL util.throw('A signed ticket cannot be rerouted');
+		END IF;
+		INSERT IGNORE INTO routeRecalc(routeFk)
+			SELECT id
+				FROM `route`
+				WHERE NOT isOk
+					AND id IN (OLD.routeFk, NEW.routeFk)
+					AND created >= util.VN_CURDATE()
+				GROUP BY id;
 	END IF;
 
 	IF NOT (DATE(NEW.shipped) <=> DATE(OLD.shipped)) THEN