From 02abda4be818fda88485193b6a51338258fb6714 Mon Sep 17 00:00:00 2001
From: Kevin Sawicki <kevinsawicki@gmail.com>
Date: Thu, 16 Jun 2016 09:26:32 -0700
Subject: [PATCH] Use isKindOfClass

---
 atom/browser/common_web_contents_delegate_mac.mm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/atom/browser/common_web_contents_delegate_mac.mm b/atom/browser/common_web_contents_delegate_mac.mm
index eeb87f2665..f473c14062 100644
--- a/atom/browser/common_web_contents_delegate_mac.mm
+++ b/atom/browser/common_web_contents_delegate_mac.mm
@@ -23,8 +23,9 @@ void CommonWebContentsDelegate::HandleKeyboardEvent(
   if (event.windowsKeyCode == ui::VKEY_ESCAPE && is_html_fullscreen())
     ExitFullscreenModeForTab(source);
 
-  if (event.os_event.window) {
-    AtomNSWindow* native_window = static_cast<AtomNSWindow*>(event.os_event.window);
+  NSWindow* window = event.os_event.window;
+  if (window && [window isKindOfClass:[AtomNSWindow class]]) {
+    AtomNSWindow* native_window = static_cast<AtomNSWindow*>(window);
     [native_window redispatchKeyEvent:event.os_event];
   }
 }