Добавляем Canonical без плагина

<!-- Self referential canonical tag on all pages -->
<?php
   if ( is_front_page() ) {
      $canonical_url = get_home_url();
      if ( ! is_main_site() ) { // add trailing slash for subsite home directories
         $canonical_url = $canonical_url . '/';
      }
   } else {
      $canonical_url = get_permalink();
   }
?>
<link rel="canonical" href="<?php echo $canonical_url ?>" />




<?php
 if( is_product_category() ) {  ?>
<?php } ?>

<link rel="canonical" href="<?php the_permalink();?>" />



<!-- Self referential canonical tag on all pages -->
<?php
   if ( is_front_page() ) {
      $canonical_url = get_home_url();
   } else {
      $canonical_url = get_permalink();
   }
?>
<link rel="canonical" href="<?php echo $canonical_url ?>" />