Index: branches/pap/ppSub/src/ppSubReadout.c
===================================================================
--- branches/pap/ppSub/src/ppSubReadout.c	(revision 23672)
+++ branches/pap/ppSub/src/ppSubReadout.c	(revision 23673)
@@ -33,4 +33,7 @@
         psError(PS_ERR_UNKNOWN, false, "Unable to match PSFs.");
         return false;
+    } else if (!data->quality) {
+        // Can't do anything at all
+        return true;
     }