From b43f6ffb6fb316e3464f4320767990f086ef1f95 Mon Sep 17 00:00:00 2001
From: Stephen Whitmore <stephen.whitmore@gmail.com>
Date: Thu, 21 Apr 2016 15:56:38 -0700
Subject: [PATCH] Makes callback optional on close.

---
 src/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index dbb8e5d..bb0f709 100644
--- a/src/index.js
+++ b/src/index.js
@@ -68,7 +68,7 @@ function TCP () {
     var count = 0
     listeners.forEach((listener) => {
       listener.close(() => {
-        if (++count === listeners.length) {
+        if (++count === listeners.length && callback) {
           callback()
         }
       })