Index: trunk/psphot/src/psphotFullForceReadout.c
===================================================================
--- trunk/psphot/src/psphotFullForceReadout.c	(revision 37321)
+++ trunk/psphot/src/psphotFullForceReadout.c	(revision 37542)
@@ -117,4 +117,10 @@
     psphotGalaxyShape (config, view, filerule);
 
+    // measure aperture photometry corrections
+    if (!psphotApResid (config, view, filerule)) {
+        psLogMsg ("psphot", 3, "failed on psphotApResid");
+        return psphotReadoutCleanup (config, view, filerule);
+    }
+
     // calculate source magnitudes (psf mag and ap mag)
     psphotMagnitudes(config, view, filerule);