Index: /trunk/ippScripts/scripts/stack_skycell.pl
===================================================================
--- /trunk/ippScripts/scripts/stack_skycell.pl	(revision 16717)
+++ /trunk/ippScripts/scripts/stack_skycell.pl	(revision 16718)
@@ -118,5 +118,5 @@
 }
 
-&my_die("Can't find camera", $stack_id, $PS_EXIT_SYS_ERROR) unless $camera;
+&my_die("Can't find camera", $stack_id, $PS_EXIT_SYS_ERROR) unless defined $camera;
 $ipprc->define_camera($camera);