Index: generic/nsf.c
===================================================================
diff -u -N -r00186f9e5281da9bf5849895d49ba625f54c3654 -r9f90d6b1ce7bfabedbda9470cb71fa368a64531c
--- generic/nsf.c	(.../nsf.c)	(revision 00186f9e5281da9bf5849895d49ba625f54c3654)
+++ generic/nsf.c	(.../nsf.c)	(revision 9f90d6b1ce7bfabedbda9470cb71fa368a64531c)
@@ -26243,7 +26243,6 @@
 
   assert(interp != NULL);
   assert(cl != NULL);
-  assert(clopt != NULL);
   assert(valueObj != NULL);
 
   for (i = 0; i < oc; i++) {
@@ -26253,6 +26252,8 @@
     }
   }
   clopt = cl->opt;
+  assert(clopt != NULL);
+
   if (clopt->classMixins != NULL) {
     if (clopt->classMixins != NULL) RemoveFromClassMixinsOf(cl->object.id, clopt->classMixins);
     CmdListFree(&clopt->classMixins, GuardDel);