Erreur avec un plugin wordpress

Bonjour,
j'aimerai trouver la solution à un problème que je rencontre dans mon site wordpress local, on me signal:
Warning: in_array() expects parameter 2 to be array, string given in C:\wamp64\www\resrvation\wp-content\plugins\wc-multi-vendor-platform-lite\public\wcmvp-class-multivendor-platform-public.php on line 1994

voici la ligne de code :

function  wcmvp_views_update()
 {
  if (is_single()) {
   $wcmvp_post_id = get_the_ID();
   $wcmvp_id = [$wcmvp_post_id];

   $wcmvp_cookie = (isset($_COOKIE['wcmvp_single_prod_view']) && !empty($_COOKIE['wcmvp_single_prod_view'])) ? sanitize_text_field(json_decode($_COOKIE['wcmvp_single_prod_view'])) : array();
  
   if (isset($wcmvp_cookie) && !in_array($wcmvp_post_id, $wcmvp_cookie)) {

    $wcmvp_merged = array_merge($wcmvp_id, $wcmvp_cookie);

    array_unique($wcmvp_merged);

    setcookie("wcmvp_single_prod_view", json_encode($wcmvp_merged), time() + (86400 * 30));

    $wcmvp_prod_meta  =  get_post_meta($wcmvp_post_id, 'wcmvp_product_view_count', true);

    if (!empty($wcmvp_prod_meta)) {

     $wcmvp_count_update = $wcmvp_prod_meta + 1;
    } else {

     $wcmvp_count_update = 1;
    }

    update_post_meta($wcmvp_post_id, 'wcmvp_product_view_count', $wcmvp_count_update);
   }
  }
  if (isset($_GET["wcmvp_order_id_csv"])) {
   $wcmvp_csv_orders = explode(",", sanitize_text_field($_GET["wcmvp_order_id_csv"]));
  }

  if (isset($wcmvp_csv_orders) && !empty($wcmvp_csv_orders)) {
   $this->wcmvp_create_csv($wcmvp_csv_orders);
  }
 }

EDIT : AJout des balises de code.