Index: /branches/rel-1_0/psModules/src/objects/pmPSFtry.c
===================================================================
--- /branches/rel-1_0/psModules/src/objects/pmPSFtry.c	(revision 12713)
+++ /branches/rel-1_0/psModules/src/objects/pmPSFtry.c	(revision 12714)
@@ -5,6 +5,6 @@
  *  @author EAM, IfA
  *
- *  @version $Revision: 1.34.2.1 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-03-08 23:27:24 $
+ *  @version $Revision: 1.34.2.2 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-04-03 17:30:04 $
  *
  *  Copyright 2004 Maui High Performance Computing Center, University of Hawaii
@@ -139,4 +139,9 @@
     psTrace ("psphot.psftry", 3, "keeping %d of %ld PSF candidates (EXT)\n", Next, sources->n);
 
+    if (Next == 0) {
+        psError(PS_ERR_UNKNOWN, true, "PSFTRY_MASK_EXT_FAIL is set for all candidate PSFs");
+        return NULL;
+    }
+
     // stage 2: construct a psf (pmPSF) from this collection of model fits
     if (!pmPSFFromPSFtry (psfTry, applyWeights)) {