Index: trunk/pstamp/scripts/pstamp_job_run.pl
===================================================================
--- trunk/pstamp/scripts/pstamp_job_run.pl	(revision 18741)
+++ trunk/pstamp/scripts/pstamp_job_run.pl	(revision 18742)
@@ -92,6 +92,8 @@
 
     my $jobs = parse_md_list($metadata);
+    my $num = @$jobs;
+    die "unexpected number of jobs $num found for job: $job_id" if $num > 1;
 
-    $psjob = ${@$jobs}[0];
+    $psjob = $jobs->[0];
 }