Index: trunk/psphot/src/psphotFitSourcesLinear.c
===================================================================
--- trunk/psphot/src/psphotFitSourcesLinear.c	(revision 37555)
+++ trunk/psphot/src/psphotFitSourcesLinear.c	(revision 38039)
@@ -688,5 +688,7 @@
     assert (modelVar);
 
-    psMetadataRemoveKey (readout->analysis, "PSPHOT.MODEL.VAR"); 
+    if (modelVar) {
+      psMetadataRemoveKey (readout->analysis, "PSPHOT.MODEL.VAR"); 
+    }
 
     // clear modelVar pointers for all of the source models