Index: generic/nsf.c
===================================================================
diff -u -N -r2638eb962eec177de69d8ccd99876d4321d9e1fb -rca7f760907cd2ec83db3c852402d8d8cfc2d130a
--- generic/nsf.c	(.../nsf.c)	(revision 2638eb962eec177de69d8ccd99876d4321d9e1fb)
+++ generic/nsf.c	(.../nsf.c)	(revision ca7f760907cd2ec83db3c852402d8d8cfc2d130a)
@@ -3410,7 +3410,7 @@
      * final methodName,
      */
     cmd = Tcl_GetCommandFromObj(interp, methodHandleObj);
-    if (methodName1 != NULL) {*methodName1 = Tcl_DStringValue(methodNameDs);}
+    if (methodNameDs != NULL && methodName1 != NULL) {*methodName1 = Tcl_DStringValue(methodNameDs);}
 
     /*fprintf(stderr, "... methodname1 '%s' cmd %p\n", Tcl_DStringValue(methodNameDs), cmd);*/
     DECR_REF_COUNT(methodHandleObj);