diff --git a/include/lib/manage_table_sql.class.php b/include/lib/manage_table_sql.class.php
index f5bd9ee5d..2abca021a 100644
--- a/include/lib/manage_table_sql.class.php
+++ b/include/lib/manage_table_sql.class.php
@@ -708,7 +708,7 @@ function check()
      * @see Data_SQL.seek 
      * @return pgsql resource 
      */
-    function execute_query($p_order,$p_array=NULL)
+    function execute_query($p_order="",$p_array=NULL)
     {
          if ($p_order=="")
         {