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Edit File: class-settings.php

<?php

namespace QuadLayers\WPMI\Models;

use QuadLayers\WPMI\Models\Base;
use QuadLayers\WPMI\Models\Libraries as Models_Libraries;
/**
 * Models_Setting Class
 */
class Settings extends Base {
	protected static $instance;

/**
	 * Table name
	 *
	 * @var string
	 */
	protected $table = 'menu_icons_pro_settings';

/* CRUD */

/**
	 * Function to get default args
	 *
	 * @return array
	 */
	public function get_args() {
		$models_libraries = Models_Libraries::instance();
		return array(
			'active_libraries' => array_keys( $models_libraries->get_libraries() ),
		);
	}

/**
	 * Function to get all settings
	 *
	 * @return array
	 */
	public function get() {
		$settings = wp_parse_args( $this->get_all(), $this->get_args() );
		return $settings;
	}

/**
	 * Function to save settings
	 *
	 * @param array $settings Settings to be saved.
	 * @return boolean
	 */
	public function save( $settings = null ) {
		return $this->save_all( $settings );
	}

/**
	 * Function to delete table
	 *
	 * @return void
	 */
	public function delete_table() {
		$this->delete_all();
	}

public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}
}