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Edit File: class-output-manager.php

<?php

/**
 * Class MC4WP_Form_Output_Manager
 *
 * @ignore
 * @access private
 */
class MC4WP_Form_Output_Manager {

/**
	 * @var int The # of forms outputted
	 */
	public $count = 0;

/**
	 * @const string
	 */
	const SHORTCODE = 'mc4wp_form';

/**
	 * Add hooks
	 */
	public function add_hooks() {
		// enable shortcodes in form content
		add_filter( 'mc4wp_form_content', 'do_shortcode' );
		add_action( 'init', array( $this, 'register_shortcode' ) );
	}

/**
	 * Registers the [mc4wp_form] shortcode
	 */
	public function register_shortcode() {
		add_shortcode( self::SHORTCODE, array( $this, 'shortcode' ) );
	}

/**
	 * @param array $attributes
	 * @param string $content
	 * @return string
	 */
	public function shortcode( $attributes = array(), $content = '' ) {
		$default_attributes = array(
			'id'            => '',
			'lists'         => '',
			'email_type'    => '',
			'element_id'    => '',
			'element_class' => '',
		);

$attributes = shortcode_atts(
			$default_attributes,
			$attributes,
			self::SHORTCODE
		);

$config = array(
			'element_id'    => $attributes['element_id'],
			'lists'         => $attributes['lists'],
			'email_type'    => $attributes['email_type'],
			'element_class' => $attributes['element_class'],
		);

return $this->output_form( $attributes['id'], $config, false );
	}

/**
	 * @param int   $id
	 * @param array $config
	 * @param bool $echo
	 *
	 * @return string
	 */
	public function output_form( $id = 0, $config = array(), $echo = true ) {
		try {
			$form = mc4wp_get_form( $id );
		} catch ( Exception $e ) {
			if ( current_user_can( 'manage_options' ) ) {
				return sprintf( '<strong>Mailchimp for WordPress error:</strong> %s', $e->getMessage() );
			}

return '';
		}

++$this->count;

// set a default element_id if none is given
		if ( empty( $config['element_id'] ) ) {
			$config['element_id'] = 'mc4wp-form-' . $this->count;
		}

$form_html = $form->get_html( $config['element_id'], $config );

try {
			// start new output buffer
			ob_start();

/**
			 * Runs just before a form element is outputted.
			 *
			 * @since 3.0
			 *
			 * @param MC4WP_Form $form
			 */
			do_action( 'mc4wp_output_form', $form );

// output the form (in output buffer)
			echo $form_html;

// grab all contents in current output buffer & then clean + end it.
			$html = ob_get_clean();
		} catch ( Error $e ) {
			$html = $form_html;
		}

// echo content if necessary
		if ( $echo ) {
			echo $html;
		}

return $html;
	}
}