Index: trunk/Ohana/src/relphot/src/StarOps.c
===================================================================
--- trunk/Ohana/src/relphot/src/StarOps.c	(revision 39926)
+++ trunk/Ohana/src/relphot/src/StarOps.c	(revision 40019)
@@ -948,5 +948,5 @@
 	xlist[N] = catalog[i].secfilt[Nsecfilt*j+Nsec].M;
 	value    = catalog[i].secfilt[Nsecfilt*j+Nsec].Mchisq;
-	if (isnan(value)) continue;
+	if (isnan((double)(value))) continue;
 	ylist[N] = value;
 	N++;