From: Daniel van Vugt <daniel.van.vugt@canonical.com>
Date: Tue, 14 Mar 2023 09:35:34 +0000 (+0800)
Subject: appDisplay: Avoid using an undefined _swipeTracker
X-Git-Tag: archive/raspbian/50.5-1+rpi1~1^2~371^2^2~94
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=b8013704cffbdedd2f82bcf38a556c6a74754615;p=gnome-shell.git

appDisplay: Avoid using an undefined _swipeTracker

It might have been deleted already during shutdown by `_onDestroy()`.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6512
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2693>
---

diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 17afb899d..75a458f7b 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -1237,7 +1237,8 @@ var BaseAppView = GObject.registerClass({
     }
 
     vfunc_unmap() {
-        this._swipeTracker.enabled = false;
+        if (this._swipeTracker)
+            this._swipeTracker.enabled = false;
         this._disconnectDnD();
         super.vfunc_unmap();
     }