Pagination not working after updating WordPress 4.4?

Hi,

I’ve faced pagination problem in my theme after updating WordPress 4.4 version.

Here is my code :

// Pagination $paged
global $post, $paged;
if( get_query_var( 'paged' ) )
  $my_page = get_query_var( 'paged' );
else {
  if( get_query_var( 'page' ) )
    $my_page = get_query_var( 'page' );
  else
    $my_page = 1;
  set_query_var( 'paged', $my_page );
  $paged = $my_page;
}

// Query
$args = array(
  'paged' => esc_attr($my_page),
  'post_type' => 'post',
  'order' => $blog_order,
  'orderby' => $blog_orderby,
  'offset' => (int)$blog_offset
);
$wpbp = new WP_Query( $args );

// Output
if ($wpbp->have_posts()) : while ($wpbp->have_posts()) : $wpbp->the_post();
	get_template_part( 'content', get_post_format() );
        echo my_theme_paging_nav();
endwhile;
else :
         get_template_part( 'content', 'none' );
endif;

And my_theme_paging_nav() function at functions.php file.

if ( ! function_exists( 'my_theme_paging_nav' ) ) {
function my_theme_paging_nav() {
global $wp_query;
	$big = 999999999;
	if($wp_query->max_num_pages == '1' ) {
	} else {
		echo "";
	}
	echo paginate_links( array(
		'base' => str_replace( $big, '%#%', get_pagenum_link( $big ) ),
		'format' => '?paged=%#%',
		'prev_text' => __( 'OLDER POSTS', 'text-domain' ),
		'next_text' => __( 'NEWER POSTS', 'text-domain' ),
		'current' => max( 1, get_query_var('paged') ),
		'total' => $wp_query->max_num_pages,
		'type' => 'list'
	));
	if($wp_query->max_num_pages == '1' ) {
	} else {
		echo "";
	}
}
}

Can you please let me know the changes in WordPress 4.4 from this code?

Thanks! 🙂