Index: trunk/psastro/src/psastroDemoDump.c
===================================================================
--- trunk/psastro/src/psastroDemoDump.c	(revision 26259)
+++ trunk/psastro/src/psastroDemoDump.c	(revision 39926)
@@ -234,4 +234,10 @@
         if (!chip->process || !chip->file_exists || !chip->data_exists) { continue; }
 
+	if (!chip->toFPA || !chip->fromFPA) {
+	  char *name = psMetadataLookupStr (NULL, chip->concepts, "CHIP.NAME");
+	  fprintf (stderr, "no astrom model for %s, skipping\n", name);
+	  continue;
+	}
+
 	// XXX write out the four corners for a test
 	psRegion *region = pmChipPixels (chip);