Index: /trunk/psphot/src/psphotRoughClass.c
===================================================================
--- /trunk/psphot/src/psphotRoughClass.c	(revision 7506)
+++ /trunk/psphot/src/psphotRoughClass.c	(revision 7507)
@@ -11,4 +11,7 @@
     psLogMsg ("psphot", 3, "psf clump DX, DY: %f, %f\n", psfClump.dX, psfClump.dY);
 
+    // did we find a valid psfClump?
+    if (!psfClump.X || !psfClump.Y) return false;
+
     // group into STAR, COSMIC, EXTENDED, SATURATED, etc.
     pmSourceRoughClass (sources, recipe, psfClump);