From 4c3a1606f20fff851a35d791a9aeb2e80e99c44a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 25 Sep 2024 07:25:38 +0530
Subject: [PATCH] Make is_dark_theme() not raise an exception when no
 QApplication is constructed

---
 src/calibre/gui2/__init__.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/calibre/gui2/__init__.py b/src/calibre/gui2/__init__.py
index 2aad89decd06..83cbbf0ff455 100644
--- a/src/calibre/gui2/__init__.py
+++ b/src/calibre/gui2/__init__.py
@@ -1002,8 +1002,11 @@ def choose_files_and_remember_all_files(
 
 
 def is_dark_theme():
-    pal = QApplication.instance().palette()
-    return pal.is_dark_theme()
+    app = QApplication.instance()
+    if app is not None:
+        pal = QApplication.instance().palette()
+        return pal.is_dark_theme()
+    return False
 
 
 def choose_osx_app(window, name, title, default_dir='/Applications'):