Index: trunk/ppSub/src/ppSubMatchPSFs.c
===================================================================
--- trunk/ppSub/src/ppSubMatchPSFs.c	(revision 36441)
+++ trunk/ppSub/src/ppSubMatchPSFs.c	(revision 36581)
@@ -156,8 +156,13 @@
     psLogMsg("ppSub", PS_LOG_INFO, "Input FWHM: %f\nReference FWHM: %f\n", inFWHM, refFWHM);
     if (!isfinite(inFWHM) || !isfinite(refFWHM)) {
+#ifdef SET_QUALITY_INSTEAD_OF_ERROR
         psErrorStackPrint(stderr, "Cannot determine FHWM for images, giving up.");
         int error = psErrorCodeLast(); // Error code
         ppSubDataQuality(data, error, PPSUB_FILES_ALL);
         return true;
+#else
+        psError(PPSUB_ERR_DATA, false, "Cannot determine FHWM for images, giving up.");
+        return false;
+#endif
     }