Index: trunk/psphot/src/psphotSourceStats.c
===================================================================
--- trunk/psphot/src/psphotSourceStats.c	(revision 33089)
+++ trunk/psphot/src/psphotSourceStats.c	(revision 33840)
@@ -605,4 +605,7 @@
     }
     psAssert (isfinite(Sigma), "did we miss a case?");
+    if (!isfinite(minKronRadius)) {
+        minKronRadius = Sigma;
+    }
 
     // choose a grid scale that is a fixed fraction of the psf sigma^2