From 81c347777f0bbee54124317108057e97c812ee25 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 15 Jun 2023 08:07:29 +0530
Subject: [PATCH] ...

---
 src/calibre/ebooks/mobi/reader/mobi6.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/ebooks/mobi/reader/mobi6.py b/src/calibre/ebooks/mobi/reader/mobi6.py
index de1f42f102..75e43a1926 100644
--- a/src/calibre/ebooks/mobi/reader/mobi6.py
+++ b/src/calibre/ebooks/mobi/reader/mobi6.py
@@ -791,6 +791,7 @@ class MobiReader:
             try:
                 num += (ord(data[off:off+1]) & 0x3) + 1
             except TypeError:
+                self.log.warn('Invalid sizeof trailing entries')
                 num += 1
         return num