Double click on submit make double entry

We have a website with several forms. The cliënt told me they sometimes receive two submissions at the exact same time.

I’ve tried to duplicate this problem. When double-clicking the submit button, I indeed get two entries instead of one.

Is there something we can do about this?

Thanks in advance!
-Kevin

Hi Noeste. One of my colleagues created this, which will put up a “loading” modal so the visitor knows the submission is being processed:

You can see a demo of it here:
https://dev.ur1.es/modal-onclick/

Will something like that work for you?

Is the form using the standard submit button? If the button has been replaced using a filter, such as gform_submit_button, and the standard attributes have not been retained that would explain the issue. One of the attributes included with the standard button handles blocking extra submissions from duplicate clicks.