- ubus_msg_init(ub, UBUS_MSG_UNSUBSCRIBE, ++s->subscriber->invoke_seq, 0);
- ubus_msg_send(s->subscriber->client, ub, true);
+ if (ub != NULL) {
+ ubus_msg_init(ub, UBUS_MSG_UNSUBSCRIBE, ++s->subscriber->invoke_seq, 0);
+ ubus_msg_send(s->subscriber->client, ub, true);
+ }