From ed963bfdada5c7e3cb68f1e386a0b388c00161b9 Mon Sep 17 00:00:00 2001
From: cTn <ctndesigner@gmail.com>
Date: Mon, 20 Jan 2014 20:15:23 +0100
Subject: [PATCH] bugfix

---
 background.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/background.js b/background.js
index 8e324d8c05..3c50737271 100644
--- a/background.js
+++ b/background.js
@@ -7,8 +7,12 @@ function start_app() {
         window_child.onClosed.addListener(function() {
             // connectionId is passed from the script side through the chrome.runtime.getBackgroundPage refference
             // allowing us to automatically close the port when application shut down
-            if (app_window.serial.connectionId > 0) {
-                chrome.serial.disconnect(app_window.serial.connectionId, function(result) {
+            
+            // save connectionId in separate variable before app_window is destroyed
+            var connectionId = app_window.serial.connectionId;
+            
+            if (connectionId > 0) {
+                chrome.serial.disconnect(connectionId, function(result) {
                     console.log('SERIAL: Connection closed - ' + result);
                 });
             }