From cbab33039a201b9117625689901b899ee83085dc Mon Sep 17 00:00:00 2001
From: Alexey Kasyanchuk <degitx@gmail.com>
Date: Sat, 17 Feb 2018 20:16:07 +0300
Subject: [PATCH] fix(app): messaging on closing

---
 src/background/background.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/background/background.js b/src/background/background.js
index 269639d..625951b 100644
--- a/src/background/background.js
+++ b/src/background/background.js
@@ -323,7 +323,10 @@ app.on("ready", () => {
 
   if (env.name === "production") { autoUpdater.checkForUpdates() }
 
-    spider = spiderCall((...data) => mainWindow.webContents.send(...data), (message, callback) => {
+    spider = spiderCall((...data) => { 
+      if(mainWindow)
+        mainWindow.webContents.send(...data) 
+    }, (message, callback) => {
       ipcMain.on(message, (event, arg) => {
          if(Array.isArray(arg) && typeof arg[arg.length - 1] === 'object' && arg[arg.length - 1].callback)
          {