From 140651c258ddf738a96268be99b82a9cc8ca54c8 Mon Sep 17 00:00:00 2001
From: Kevin Sawicki <kevinsawicki@gmail.com>
Date: Fri, 30 Sep 2016 15:04:13 -0700
Subject: [PATCH] Ignore already closed windows

---
 atom/browser/window_list.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/atom/browser/window_list.cc b/atom/browser/window_list.cc
index 83bf615aad25..b8e5a8256530 100644
--- a/atom/browser/window_list.cc
+++ b/atom/browser/window_list.cc
@@ -71,7 +71,8 @@ void WindowList::RemoveObserver(WindowListObserver* observer) {
 void WindowList::CloseAllWindows() {
   WindowVector windows = GetInstance()->windows_;
   for (const auto& window : windows)
-    window->Close();
+    if (!window->IsClosed())
+      window->Close();
 }
 
 WindowList::WindowList() {