Index: generic/nsf.c
===================================================================
diff -u -r625a3e7b5660331938ab739fb28eda3d5540e189 -r7ba7b3c49ff542688258f50fba2fc8102f23a011
--- generic/nsf.c	(.../nsf.c)	(revision 625a3e7b5660331938ab739fb28eda3d5540e189)
+++ generic/nsf.c	(.../nsf.c)	(revision 7ba7b3c49ff542688258f50fba2fc8102f23a011)
@@ -22586,6 +22586,10 @@
 
   ParamDefsRefCountDecr(paramDefs);
   ParseContextRelease(&pc);
+
+  if (result == TCL_OK) {
+    Tcl_ResetResult(interp);
+  }
   return result;
 }