When I click "TEST EMAIL" I receive the email but form_title is not fil

When I click "TEST EMAIL" I receive the email but form_title is not filled in. I can understand if the fields are not filled in, but that form already has a title. Will it work fine when published?

Kindly try setting up the form title variable from the options shown on the email wizard, here is how:

If the problem persists, please provide us the form you're working on so we can have a look on this.