Skip Formidable Forms User Registration Action

frm-skip-action.php

<?php

add_filter( 'frm_skip_form_action', 'form_action_conditions', 10, 2 );
/**
 * @param $skip_this_action
 * @param $args
 * @return bool
 *
 * Skips user registration actiom if
 * email address is already registered 
 * on the site to avoid validation
 * error and allow the form to submit.
 */
function form_action_conditions( $skip_this_action, $args ) {

    $user_actions = array(13434, 11454);
    if ( 11454 === $args['action']->ID ) {

        if ( is_object( $args['entry'] ) ) {
            $entry = $args['entry'];
        } else {
            $entry = FrmEntry::getOne( $args['entry'], true );
        }

        $email_field = 57;// Replace 104 with your field ID

        if ( email_exists( $entry->metas[ $email_field ] ) ) {

            $skip_this_action = true;
        }
    }
    return $skip_this_action;
}