Index: trunk/ppSub/src/ppSubReadout.c
===================================================================
--- trunk/ppSub/src/ppSubReadout.c	(revision 14821)
+++ trunk/ppSub/src/ppSubReadout.c	(revision 14847)
@@ -140,5 +140,8 @@
         pmFPACopy(photFile->fpa, outRO->parent->parent->parent);
 
-        psphotReadout(config, view);
+        if (!psphotReadout(config, view)) {
+            psError(psErrorCodeLast(), false, "Unable to perform photometry on subtracted image.\n");
+            return false;
+        }
 
         pmFPAfileActivate(config->files, false, "PSPHOT.INPUT");