Index: /trunk/Ohana/src/relphot/src/StarOps.c
===================================================================
--- /trunk/Ohana/src/relphot/src/StarOps.c	(revision 17284)
+++ /trunk/Ohana/src/relphot/src/StarOps.c	(revision 17285)
@@ -181,4 +181,6 @@
 
 	  Msys = PhotSys (&catalog[i].measure[m], &catalog[i].average[j], &catalog[i].secfilt[j*PhotNsec]);
+	  if (isnan(Msys)) continue;
+
 	  list[N] = Msys - catalog[i].measure[m].Mcal;
 	  dlist[N] = MAX (catalog[i].measure[m].dM, MIN_ERROR);