Index: trunk/ippMonitor/raw/czartool_labels.php
===================================================================
--- trunk/ippMonitor/raw/czartool_labels.php	(revision 40883)
+++ trunk/ippMonitor/raw/czartool_labels.php	(revision 40936)
@@ -464,4 +464,7 @@
     }
     $qry->fetchInto($refExpID);
+    if ($refExpID[0] = 'NULL') {
+        $refExpID[0] = 0;
+    }
 
     #Find the number of chunks