Index: generic/nsf.c
===================================================================
diff -u -rda6d8cc3d3c239c24849b7e42cc4c9878af9e175 -rf01f68eae4db5c767f8d5ce3cd0e366fb298b73b
--- generic/nsf.c	(.../nsf.c)	(revision da6d8cc3d3c239c24849b7e42cc4c9878af9e175)
+++ generic/nsf.c	(.../nsf.c)	(revision f01f68eae4db5c767f8d5ce3cd0e366fb298b73b)
@@ -5347,9 +5347,11 @@
   unsigned int frameFlags;
   Tcl_Obj *key;
 
+#if defined(NSF_DEVELOPMENT)
   nonnull_assert(interp != NULL);
   nonnull_assert(varName != NULL);
   nonnull_assert(varPtr != NULL);
+#endif
 
 #if defined(VAR_RESOLVER_TRACE)
   fprintf(stderr, "NsColonVarResolver '%s' flags %.6x\n", varName, flags);