Index: /trunk/psphot/src/psphotSourceSize.c
===================================================================
--- /trunk/psphot/src/psphotSourceSize.c	(revision 20254)
+++ /trunk/psphot/src/psphotSourceSize.c	(revision 20255)
@@ -144,5 +144,5 @@
         }
         source->crNsigma  = (nCR > 0)  ? fCR / nCR : 0.0;
-        assert (isfinite(source->crNsigma));
+        if (!isfinite(source->crNsigma)) continue;
 
         // this source is thought to be a cosmic ray.  flag the detection and mask the pixels