Index: /trunk/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm
===================================================================
--- /trunk/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm	(revision 27021)
+++ /trunk/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm	(revision 27022)
@@ -62,4 +62,7 @@
     if (!iszero($mjd_max)) {
         $dateobs_end = mjd_to_dateobs($mjd_max);
+    }
+    if (isnull($tess_id)) {
+        $tess_id = undef;
     }