Index: /trunk/psphot/src/psphotOutput.c
===================================================================
--- /trunk/psphot/src/psphotOutput.c	(revision 11312)
+++ /trunk/psphot/src/psphotOutput.c	(revision 11313)
@@ -110,4 +110,7 @@
     psMetadataItemTransfer (header, recipe, "SKY_NX");
     psMetadataItemTransfer (header, recipe, "SKY_NY");
+    
+    // XXX : don't require any of these about values to exist
+    psErrorClear ();
 
     return header;