diff --git a/includes/rules_shipping_framework_woocommerce_advanced.php b/includes/rules_shipping_framework_woocommerce_advanced.php
index 77c89f3a8dfc322c7387eb1314512d3066fffb64..eb8ace3ab4d59d11582de2cf50b85e587e34ed2e 100644
--- a/includes/rules_shipping_framework_woocommerce_advanced.php
+++ b/includes/rules_shipping_framework_woocommerce_advanced.php
@@ -9,7 +9,9 @@
 if ( !defined( 'ABSPATH' ) ) { 
 	die( 'Direct Access to ' . basename( __FILE__ ) . ' is not allowed.' );
 }
-require_once( plugin_dir_path( __FILE__ ) . '/rules_shipping_framework_woocommerce.php');
+if (!class_exists('RulesShippingFrameworkWooCommerce')) {
+	require_once( plugin_dir_path( __FILE__ ) . '/rules_shipping_framework_woocommerce.php');
+}
 
 class RulesShippingFrameworkWooCommerceAdvanced extends RulesShippingFrameworkWooCommerce {