Index: temp/trunk/data/class/SC_CustomerList.php
===================================================================
--- temp/trunk/data/class/SC_CustomerList.php	(revision 5934)
+++ temp/trunk/data/class/SC_CustomerList.php	(revision 9973)
@@ -243,5 +243,5 @@
 			if($tmp_where != "") {
 				$this->setWhere( " customer_id IN (SELECT distinct customer_id FROM dtb_order WHERE order_id IN (SELECT distinct order_id FROM dtb_order_detail WHERE product_id IN (SELECT product_id FROM dtb_products WHERE ".$tmp_where." ))) ");
-				$this->arrVal = array_merge($this->arrVal, $tmp_arrval);
+				$this->arrVal = array_merge((array)$this->arrVal, (array)$tmp_arrval);
 			}
 		}