Zoho Forms - Duplicates

Zoho Forms - Duplicates

We have a Zoho webform on our website that feeds into Leads. We have noticed that if the user hits 'submit' more than once (As many unfortauntely will do if experiencing lag) then they will be registered as a lead twice. This is not good, as it creates clustered data and spams our emails.

Please assist if anybody has a solution - our only option at this point would be to remove the Zoho webform.

Thanks!