Index: /branches/eam_branches/largefiles.20100314/Ohana/src/libdvo/src/skyregion_io.c
===================================================================
--- /branches/eam_branches/largefiles.20100314/Ohana/src/libdvo/src/skyregion_io.c	(revision 27373)
+++ /branches/eam_branches/largefiles.20100314/Ohana/src/libdvo/src/skyregion_io.c	(revision 27374)
@@ -126,4 +126,10 @@
 
   /* third option: GSCFILE */
+
+  if (gscfile == NULL) {
+    fprintf (stderr, "error loading sky table from existing db (%s)\n", catdir);
+    return (NULL);
+  }
+
   sky = SkyTableFromGSC (gscfile, depth, verbose);
   if (sky == NULL) {