File gnome-shell-can-not-load-calendars.patch of Package gnome-shell

diff --git a/js/ui/calendar.js b/js/ui/calendar.js
index 4ff0540ba..f29a7cf4c 100644
--- a/js/ui/calendar.js
+++ b/js/ui/calendar.js
@@ -217,6 +217,24 @@ class DBusEventSource extends EventSourceBase {
     async _initProxy() {
         let loaded = false;
 
+        try {
+            const SERVICE_NAME = 'org.gnome.Shell.CalendarServer';
+            const OBJECT_PATH = '/org/gnome/Shell/CalendarServer';
+
+            let proxy = new Gio.DBusProxy({
+                g_connection: Gio.DBus.session,
+                g_name: SERVICE_NAME,
+                g_object_path: OBJECT_PATH,
+                g_interface_name: 'org.freedesktop.DBus.Introspectable',
+                g_flags: Gio.DBusProxyFlags.NONE
+            });
+
+            proxy.call_sync('Introspect', null, Gio.DBusCallFlags.NONE, -1, null);
+        } catch (e) {
+            log(`Can not load calendars: ${e.message}`);
+            return;
+        }
+
         try {
             await this._dbusProxy.init_async(GLib.PRIORITY_DEFAULT, null);
             loaded = true;