From b188e9887b64cb5783b258478b6e59ad8ca76f65 Mon Sep 17 00:00:00 2001
From: Daniele <brugnara@users.noreply.github.com>
Date: Mon, 15 Sep 2014 15:07:00 +0200
Subject: [PATCH] fix

Calling `.close()` on a closed port, trow an exception. This happens when you try to open a non existent port. This patch fixes.
---
 lib/modem.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/modem.js b/lib/modem.js
index 55322cb..5726aa8 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -107,7 +107,9 @@ var createModem = function() {
 
     modem.close = function(device) {
         this.port.removeAllListeners();
-        this.port.close();
+        if (this.isOpened) {
+          this.port.close();
+        }
         this.port = null;
         this.isOpened = false;
         this.emit('close');