Index: /temp/trunk/html/admin/products/category.php
===================================================================
--- /temp/trunk/html/admin/products/category.php	(revision 6342)
+++ /temp/trunk/html/admin/products/category.php	(revision 6343)
@@ -196,4 +196,9 @@
 function lfGetCat($parent_category_id) {
 	$objQuery = new SC_Query();
+	
+	if($parent_category_id == "") {
+		$parent_category_id = '0';
+	}
+	
 	$col = "category_id, category_name, level, rank";
 	$where = "del_flg = 0 AND parent_category_id = ?";