FOX - WooCommerce Currency Switcher Professional

Plugin URL: https://wordpress.org/plugins/product-options-for-woocommerce/

• open file wp-content\plugins\product-options-for-woocommerce\Model\Observer.php
• find function add_option_price_on_checkout($cart)
• on the same top place next code:

  global $WOOCS;
  $backup_filters = null;
  if (isset($WOOCS) AND $WOOCS->is_multiple_allowed) {
          $backup_filters = isset($GLOBALS['wp_filter']['woocommerce_product_get_price']) ? $GLOBALS['wp_filter']['woocommerce_product_get_price'] : null;
          unset($GLOBALS['wp_filter']['woocommerce_product_get_price']);
  }

   

• on the same bottom, before code WC()->cart->set_session(); place next code:

  if ($backup_filters !== null) {
          $GLOBALS['wp_filter']['woocommerce_product_get_price'] = $backup_filters;
  }