Index: trunk/ippScripts/scripts/stack_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/stack_skycell.pl	(revision 23186)
+++ trunk/ippScripts/scripts/stack_skycell.pl	(revision 23295)
@@ -296,4 +296,6 @@
     my $exit_code = shift;      # Exit code to add
 
+    $exit_code = $PS_EXIT_PROG_ERROR unless defined $exit_code;
+
     carp($msg);