Writable already assures that only Buffer's are passed to _write. Also this is not the "correct" way to handle errors inside _write. PR-URL: https://github.com/nodejs/node/pull/29043 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>