Index: trunk/psphot/src/psphotMergeSources.c
===================================================================
--- trunk/psphot/src/psphotMergeSources.c	(revision 38543)
+++ trunk/psphot/src/psphotMergeSources.c	(revision 38560)
@@ -1013,5 +1013,7 @@
                         } else {
                             // What to do here? 
-                            psAssert (pcm, "pmPCMinit failed!");
+                            // psAssert (pcm, "pmPCMinit failed!");
+                            psFree (sourceOut->modelEXT);
+                            sourceOut->modelEXT = NULL;
                         }
                     } else {