From: Xiaoguang Wang <xwang@suse.com>
Date: Wed, 20 Sep 2017 01:05:16 +0000 (+0800)
Subject: workspaceThumbnails: Avoid access to undefined variables
X-Git-Tag: archive/raspbian/50.5-1+rpi1~1^2~929^2~5^2~73
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=594cc7cbef4f8ee57b316b98e86e1a82a5074904;p=gnome-shell.git

workspaceThumbnails: Avoid access to undefined variables

If thumbnails haven't been created, they don't need to be destroyed.

https://bugzilla.gnome.org/show_bug.cgi?id=787871
---

diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index c1b4bddc6..1ecdd92cc 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -884,6 +884,9 @@ var ThumbnailsBox = new Lang.Class({
     },
 
     _destroyThumbnails() {
+        if (this._thumbnails.length == 0)
+            return;
+
         if (this._switchWorkspaceNotifyId > 0) {
             global.window_manager.disconnect(this._switchWorkspaceNotifyId);
             this._switchWorkspaceNotifyId = 0;