if( ! function_exists( 'custom_related_widget_args' ) ){
    /**
     * @param array $args
     * @param string $widget_id
     * @return array
     */
    function custom_related_widget_args( $args, $widget_id ) {
        $args['post_type'] = get_post_type();
        $args['tax_query'] = array(
            'relation'  =>  'AND',
            array(
                'taxonomy' => 'category',
                'field' => 'id',
                'terms' => wp_list_pluck( wp_get_post_terms( get_the_ID(), 'category' ), 'term_id'),
                'operator'  =>  'IN'
            ),
            array(
                'taxonomy' => 'post_tag',
                'field' => 'id',
                'terms' => wp_list_pluck( wp_get_post_terms( get_the_ID(), 'post_tag' ), 'term_id'),
                'operator'  =>  'IN'
            )
        );
        return $args;
    }
    add_filter( 'mars_related_widget_args' , 'custom_related_widget_args', 100, 2 );
}