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Edit File: ActionNewsletter.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Class NF_Abstracts_ActionNewsletter
 */
abstract class NF_Abstracts_ActionNewsletter extends NF_Abstracts_Action
{
    /**
     * @var array
     */
    protected $_tags = array( 'newsletter' );

/**
     * @var string
     */
    protected $_timing = 'normal';

/**
     * @var int
     */
    protected $_priority = '10';

protected $_settings = array();

protected $_transient = '';

protected $_transient_expiration = '';

protected $_setting_labels = array(
        'list'   => 'List',
        'fields' => 'List Field Mapping',
        'groups' => 'Interest Groups',
    );

/**
     * Constructor
     */
    public function __construct()
    {
        parent::__construct();

if( ! $this->_transient ){
            $this->_transient = $this->get_name() . '_newsletter_lists';
        }

/**
         * Ajax call handled in '_get_lists', but bulk of work could be done in
         * the NewsLetter class that extends this class
         */
        add_action( 'wp_ajax_nf_' . $this->_name . '_get_lists', array( $this, '_get_lists' ) );

$this->get_list_settings();
    }

/*
    * PUBLIC METHODS
    */

public function save( $action_settings )
    {

}

public function process( $action_settings, $form_id, $data )
    {

}

public function _get_lists()
    {
        check_ajax_referer( 'ninja_forms_builder_nonce', 'security' );

$lists = $this->get_lists();

array_unshift( $lists, array( 'value' => 0, 'label' => '-', 'fields' => array(), 'groups' => array() ) );

$this->cache_lists( $lists );

echo wp_json_encode( array( 'lists' => $lists ) );

wp_die(); // this is required to terminate immediately and return a proper response
    }

/*
     * PROTECTED METHODS
     */

abstract protected function get_lists();

/*
     * PRIVATE METHODS
     */

private function get_list_settings()
    {
        $label_defaults = array(
            'list'   => 'List',
            'fields' => 'List Field Mapping',
            'groups' => 'Interest Groups',
        );
        $labels = array_merge( $label_defaults, $this->_setting_labels );

$prefix = $this->get_name();

$lists = get_transient( $this->_transient );

if( ! $lists ) {
            $lists = $this->get_lists();
            $this->cache_lists( $lists );
        }

if( empty( $lists ) ) return;

$this->_settings[ $prefix . 'newsletter_list' ] = array(
            'name' => 'newsletter_list',
            'type' => 'select',
            'label' => $labels[ 'list' ] . ' <a class="js-newsletter-list-update extra"><span class="dashicons dashicons-update"></span></a>',
            'width' => 'full',
            'group' => 'primary',
            'value' => '0',
            'options' => array(),
        );

$fields = array();
        foreach( $lists as $list ) {
            $this->_settings[ $prefix . 'newsletter_list' ][ 'options' ][] = $list;

//Check to see if list has fields array set.
            if ( isset( $list[ 'fields' ] ) ) {

foreach ( $list[ 'fields' ] as $field ) {
                    $name = $list[ 'value' ] . '_' . $field[ 'value' ];
                    $fields[] = array(
                        'name' => $name,
                        'type' => 'textbox',
                        'label' => $field[ 'label' ],
                        'width' => 'full',
                        'use_merge_tags' => array(
                            'exclude' => array(
                                'user', 'post', 'system', 'querystrings'
                            )
                        )
                    );
                }
            }
        }

$this->_settings[ $prefix . 'newsletter_list_fields' ] = array(
            'name' => 'newsletter_list_fields',
            'label' => esc_html__( 'List Field Mapping', 'ninja-forms' ),
            'type' => 'fieldset',
            'group' => 'primary',
            'settings' => array()
        );

$this->_settings[ $prefix . 'newsletter_list_groups' ] = array(
            'name' => 'newsletter_list_groups',
            'label' => esc_html__( 'Interest Groups', 'ninja-forms' ),
            'type' => 'fieldset',
            'group' => 'primary',
            'settings' => array()
        );
    }

private function cache_lists( $lists )
    {
        set_transient( $this->_transient, $lists, $this->_transient_expiration );
    }
}

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