Error after removing nickname from Profile form

I get an error message “Error: Please enter a nickname.” after removing the nickname field using this code when the user tries to edit their profile. I have purchased the Profiles add-on.

function remove_tml_profile_fields() {
        tml_remove_form_field( 'profile', 'first_name' );
        tml_remove_form_field( 'profile', 'last_name' );
        tml_remove_form_field( 'profile', 'nickname' );
}
add_action( 'init', 'remove_tml_profile_fields' );