diff --git a/autoload/admin/factory/class.ShopProduct.php b/autoload/admin/factory/class.ShopProduct.php
index bdb7b0b..0e72550 100644
--- a/autoload/admin/factory/class.ShopProduct.php
+++ b/autoload/admin/factory/class.ShopProduct.php
@@ -1262,7 +1262,7 @@ class ShopProduct
       {
         if ( !empty( $custom_field ) )
         {
-          $exits_custom_ids[] = $mdb -> get( 'pp_shop_products_custom_fields', 'id_additional_field', [ 'AND' => [ 'id_product' => $product_id, 'name' => $custom_field ] ] );
+          $exits_custom_ids[] = (int)$mdb -> get( 'pp_shop_products_custom_fields', 'id_additional_field', [ 'AND' => [ 'id_product' => $product_id, 'name' => $custom_field ] ] );
         }
       }