Index: trunk/pstamp/scripts/pstampparse.pl
===================================================================
--- trunk/pstamp/scripts/pstampparse.pl	(revision 28740)
+++ trunk/pstamp/scripts/pstampparse.pl	(revision 28741)
@@ -814,4 +814,12 @@
         ($stage ne 'chip' and $state eq 'full')) {
         my_die("$stage $stage_id is in unexpected state $state", $PS_EXIT_PROG_ERROR);
+    }
+
+    if (($stage eq 'diff') and ($stage_id <= 22778)) {
+    	print STDERR "diff_id $stage_id cannot be updated\n";
+	$$r_dep_id = 0;
+	$$r_fault = $PSTAMP_GONE;
+	$$r_jobState = 'stop';
+	return;
     }