From 4eda7a69fd1483fdd62ca52fabe223d362c2f96f Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 26 Mar 2021 22:40:29 +0530
Subject: [PATCH] Fix #1921530 [Private
 bug](https://bugs.launchpad.net/calibre/+bug/1921530)

---
 src/pyj/read_book/view.pyj | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index 0789960f2d..b478707874 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -1095,7 +1095,7 @@ class View:
         if not self.book or not self.book.manifest:
             return
         index, refnum = reference.split('.')
-        index, refnum = int(index), int(refnum)
+        index, refnum = int(index), (int(refnum) if refnum else 1)
         chapter_name = self.book.manifest.spine[index]
         if not chapter_name:
             return False