Index: generic/nsf.c
===================================================================
diff -u -r8e97011d5cc313b02f63d3282ce9b08b0a8e1746 -rf382a52eae04f756f474bbee8eaf93b5e72669d8
--- generic/nsf.c	(.../nsf.c)	(revision 8e97011d5cc313b02f63d3282ce9b08b0a8e1746)
+++ generic/nsf.c	(.../nsf.c)	(revision f382a52eae04f756f474bbee8eaf93b5e72669d8)
@@ -12021,6 +12021,7 @@
   nonnull_assert(formatFunction != NULL);
   assert(pPtr->type != NULL);
 
+  parsedParam.paramDefs = NULL;
   if (strcmp(pPtr->type, "virtualobjectargs") == 0) {
     result = GetObjectParameterDefinition(interp, NsfGlobalObjs[NSF_EMPTY], contextObject, NULL, &parsedParam);
   } else if (NsfObjectIsClass(contextObject)) {