diff --git a/rules_shipping_advanced.php b/rules_shipping_advanced.php
index 3d81055e9ee070b7bafca77af64324bc3bd32ccb..e32ccbc062ede2b6b18229d155e23ef70f5b608b 100644
--- a/rules_shipping_advanced.php
+++ b/rules_shipping_advanced.php
@@ -194,8 +194,8 @@ class ShippingRule_Advanced extends ShippingRule {
 		$is_condition = false;
 		$is_assignment = false;
 		
-		$stack = array ();  // 1)
-		$prev_token_operator = false;
+		$stack = array ();  // 1)/
+		$prev_token_operator = true;
 		$function_args = array();
 		$out_stack = array();
 		foreach ($atoms as $a) { // 2)