Index: lib/dmllib.php
===================================================================
--- lib/dmllib.php	(revision 1432)
+++ lib/dmllib.php	(working copy)
@@ -849,6 +849,10 @@
  * @param ADORecordSet the recordset to be closed
  */
 function rs_close(&$rs) {
+    if (empty($rs)) {
+        debugging('Incorrect rs used!');
+        return false;
+    }
 
     $rs->Close();
 }