Index: generic/nsf.c
===================================================================
diff -u -N -r980112e05d7bbaeb96b9f58efb7b8a0f881b0626 -r31c3da1f75d17f7c3e10dc4d1652dacf57716bb6
--- generic/nsf.c	(.../nsf.c)	(revision 980112e05d7bbaeb96b9f58efb7b8a0f881b0626)
+++ generic/nsf.c	(.../nsf.c)	(revision 31c3da1f75d17f7c3e10dc4d1652dacf57716bb6)
@@ -21650,10 +21650,11 @@
    * Omit argument checking, provided that ...
    * ... argument checking is turned off *and* no converter is specified, or
    * ... the ruling parameter option is 'initcmd'
+   * ... slotset is active
    */
-  if ((unlikely((doCheckArguments & NSF_ARGPARSE_CHECK) == 0u)
-       && (pPtr->flags & (NSF_ARG_IS_CONVERTER)) == 0u
-       ) || ((pPtr->flags & (NSF_ARG_CMD)) != 0u)) {
+  if ((unlikely((doCheckArguments & NSF_ARGPARSE_CHECK) == 0u) && (pPtr->flags & (NSF_ARG_IS_CONVERTER)) == 0u) ||
+      ((pPtr->flags & (NSF_ARG_CMD)) != 0u) ||
+      ((pPtr->flags & NSF_ARG_SLOTSET) != 0u)) {
     /* fprintf(stderr, "*** omit  argument check for arg %s flags %.6x\n", pPtr->name, pPtr->flags); */
     *clientData = ObjStr(objPtr);
     return TCL_OK;