From cd6d5156e067d4a72c672f28e2feae76049306b6 Mon Sep 17 00:00:00 2001 From: Kovid Goyal Date: Fri, 18 Dec 2020 17:44:49 +0530 Subject: [PATCH] Fix #1908707 [Private bug](https://bugs.launchpad.net/calibre/+bug/1908707) --- src/calibre/gui2/lrf_renderer/document.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/calibre/gui2/lrf_renderer/document.py b/src/calibre/gui2/lrf_renderer/document.py index 2853e1a45e..225e1147f6 100644 --- a/src/calibre/gui2/lrf_renderer/document.py +++ b/src/calibre/gui2/lrf_renderer/document.py @@ -353,7 +353,7 @@ class History(collections.deque): class Document(QGraphicsScene): - num_of_pages = property(fget=lambda self: sum(self.chapter_layout)) + num_of_pages = property(fget=lambda self: sum(self.chapter_layout or ())) chapter_rendered = pyqtSignal(object) page_changed = pyqtSignal(object)