Apostrophe in email

We are using Events Manager on our intranet type site, but we’ve got a few users with apostrophes in their email address.

When they try to enter their email address E.g. ‘firstname.o’surname@domain.suffix’ into Events Manager, they get “ERROR: The email address isn’t correct.”

I see that this is apparently fixed in core, so I’m presuming that this is the form validation in EM?

Could anyone suggest a fix or workaround?

Cheers

https://wordpress.org/plugins/events-manager/