From c60d61a777a08dad64ac2dce536e51caa72c088d Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 2 Aug 2022 19:06:34 +0530
Subject: [PATCH] Fix spurious AttributeError during shutdown

---
 src/calibre/gui2/dialogs/scheduler.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/dialogs/scheduler.py b/src/calibre/gui2/dialogs/scheduler.py
index c133d872ae..c5ba3a5ed8 100644
--- a/src/calibre/gui2/dialogs/scheduler.py
+++ b/src/calibre/gui2/dialogs/scheduler.py
@@ -9,6 +9,7 @@ Scheduler for automated recipe downloads
 from datetime import timedelta
 import calendar, textwrap
 from collections import OrderedDict
+from contextlib import suppress
 
 from qt.core import (
     QDialog, Qt, QTime, QObject, QMenu, QHBoxLayout, QAction, QIcon, QRecursiveMutex, QApplication,
@@ -611,7 +612,7 @@ class Scheduler(QObject):
     def db(self):
         from calibre.gui2.ui import get_gui
         gui = get_gui()
-        if gui is not None:
+        with suppress(AttributeError):
             ans = gui.current_db
             if not ans.new_api.is_doing_rebuild_or_vacuum:
                 return ans