diff --git a/db/routines/vn/procedures/ticket_setNextState.sql b/db/routines/vn/procedures/ticket_setNextState.sql
index d13cd53f0e..43edfc637b 100644
--- a/db/routines/vn/procedures/ticket_setNextState.sql
+++ b/db/routines/vn/procedures/ticket_setNextState.sql
@@ -9,6 +9,10 @@ BEGIN
 	DECLARE vStateFk INT;
 	DECLARE vNewStateFk INT;
 
+	IF vSelf IS NULL THEN
+	CALL util.throw("Ticket not valid");
+	END IF;
+
 	SELECT stateFk INTO vStateFk
 		FROM ticketState
 		WHERE ticketFk = vSelf;