Index: includes/wmi.inc.php
===================================================================
--- includes/wmi.inc.php	(revision 6449)
+++ includes/wmi.inc.php	(working copy)
@@ -100,7 +100,7 @@
     }
     else
     {
-      $wmi_results[] = array_combine($wmi_properties, explode($GLOBALS['config']['wmi']['delimiter'],$line));
+      $wmi_results[] = array_combine($wmi_properties, explode($GLOBALS['config']['wmi']['delimiter'], str_replace("(null)", NULL, $line)));
     }
   }
   if (count($wmi_results) == 1)