Scenario stopped because of label already existing in a trello card

Hi everyone,

I created an scenario using my order management system’s API, when the status of an order is updated there, make searches for that order/card and assigns a label in a Trello Card (depending on the status added).
Sometimes, orders are updated twice hence a label is added successfully the first time, but next time, the scenario is stopped. Can I get some help to avoid the scenario stopping or what to do in the case the label already exists in that card, failure to complete steps would not stop the scenario?

Thank you.