Index: trunk/psModules/src/objects/pmModel.c
===================================================================
--- trunk/psModules/src/objects/pmModel.c	(revision 15889)
+++ trunk/psModules/src/objects/pmModel.c	(revision 15977)
@@ -6,6 +6,6 @@
  *  @author EAM, IfA
  *
- *  @version $Revision: 1.21 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-11-27 22:46:33 $
+ *  @version $Revision: 1.22 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2008-01-02 20:36:36 $
  *
  *  Copyright 2004 Maui High Performance Computing Center, University of Hawaii
@@ -130,7 +130,7 @@
 {
     psTrace("psModules.objects", 3, "---- %s() begin ----\n", __func__);
-    PS_ASSERT_PTR_NON_NULL(image, false);
-    PS_ASSERT_PTR_NON_NULL(model, false);
-    PS_ASSERT_PTR_NON_NULL(model->params, false);
+    PS_ASSERT_PTR_NON_NULL(image, NAN);
+    PS_ASSERT_PTR_NON_NULL(model, NAN);
+    PS_ASSERT_PTR_NON_NULL(model->params, NAN);
 
     // Allocate the x coordinate structure and convert row/col to image space.