Index: generic/nsf.c
===================================================================
diff -u -N -r308a9122fcd679ed416ce55670ea93aab4b87478 -re982277aa68541c759df117ba68dc02c16a4f443
--- generic/nsf.c	(.../nsf.c)	(revision 308a9122fcd679ed416ce55670ea93aab4b87478)
+++ generic/nsf.c	(.../nsf.c)	(revision e982277aa68541c759df117ba68dc02c16a4f443)
@@ -17828,11 +17828,10 @@
       }
     }
 
-    if (objc > 0) {
+    if (objc > 0 && (objv != NULL || cscPtr->objv != NULL)) {
       /*
        * Copy the remaining argument vector
        */
-      assert((objv != NULL) || (cscPtr->objv != NULL));
       memcpy(nobjv + methodNameLength, objv == NULL ? cscPtr->objv : objv, sizeof(Tcl_Obj *) * objc);
     }