From a52ec8f286afd8b620b795cb62f7b9c37e000c7e Mon Sep 17 00:00:00 2001
From: Adel Gadllah <adel.gadllah@gmail.com>
Date: Wed, 9 Feb 2011 20:42:44 +0100
Subject: [PATCH] appSwitcher: Don't create thumbnails for destroyed windows

---
 js/ui/altTab.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 46c2a09bf..28d2b911f 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -1081,6 +1081,9 @@ ThumbnailList.prototype = {
 
         for (let i = 0; i < this._thumbnailBins.length; i++) {
             let mutterWindow = this._windows[i].get_compositor_private();
+            if (!mutterWindow)
+                continue;
+
             let windowTexture = mutterWindow.get_texture ();
             let [width, height] = windowTexture.get_size();
             let scale = Math.min(1.0, THUMBNAIL_DEFAULT_SIZE / width, availHeight / height);