Index: trunk/psphot/src/psphotImageLoop.c
===================================================================
--- trunk/psphot/src/psphotImageLoop.c	(revision 23808)
+++ trunk/psphot/src/psphotImageLoop.c	(revision 23957)
@@ -75,4 +75,11 @@
                 }
 
+                psImageMaskType maskSat = pmConfigMaskGet("SAT", config); // Mask value for saturated pixels
+                if (!pmReadoutMaskNonfinite(readout, maskSat)) {
+                    psError(psErrorCodeLast(), false, "Unable to mask non-finite pixels.");
+                    psFree(view);
+                    return false;
+                }
+
                 // run the actual photometry analysis on this chip/cell/readout
                 if (!psphotReadout (config, view)) {