Index: generic/nsf.c
===================================================================
diff -u -r2ae5dc3a57671282e60078ea575f00081b0af47e -r1907ffde1a2f350e2e96f3b8c55cfa36b7b97320
--- generic/nsf.c	(.../nsf.c)	(revision 2ae5dc3a57671282e60078ea575f00081b0af47e)
+++ generic/nsf.c	(.../nsf.c)	(revision 1907ffde1a2f350e2e96f3b8c55cfa36b7b97320)
@@ -20988,6 +20988,14 @@
     return result;
   }
 
+  if (parsedParam.paramDefs == NULL) {
+    switch (parametersubcmd) {
+    case ParametersubcmdNameIdx:
+      Tcl_SetObjResult(interp, parameterspec);
+      return TCL_OK;
+    default: return NsfPrintError(interp, "flag not implemented");
+    }
+  }
   paramsPtr = parsedParam.paramDefs->paramsPtr;
 
   switch (parametersubcmd) {