As it turns out there's no information available online on how to undo this superstition.
Sources suggest that some people believe that it's not always bad luck to open an umbrella indoors. Some people believe it's only bad luck if the umbrella is black, was a gift, has never been used outdoors, or there's a sick person in the house!
We all fall victims of bad luck which tends to spoil our day and scare us as well. If you want to get rid of bad luck, here are some best ways to get rid of bad luck naturally from Boldsky.com.