From e973b575a5b0ec9f0fdf4c4bff645466e6be1fcd Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 10 Aug 2018 11:59:49 +0530
Subject: [PATCH] DOCX Input: Fix an error when converting some DOCX files with
 inherited fonts. Fixes #1786414 [Python failure during conversion from
 .docx](https://bugs.launchpad.net/calibre/+bug/1786414)

---
 src/calibre/ebooks/docx/fonts.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/docx/fonts.py b/src/calibre/ebooks/docx/fonts.py
index 4414ebabe9..f92519ddb7 100644
--- a/src/calibre/ebooks/docx/fonts.py
+++ b/src/calibre/ebooks/docx/fonts.py
@@ -111,7 +111,10 @@ SYMBOL_FONT_NAMES = frozenset(n.lower() for n in SYMBOL_MAPS)
 
 
 def is_symbol_font(family):
-    return family.lower() in SYMBOL_FONT_NAMES
+    try:
+        return family.lower() in SYMBOL_FONT_NAMES
+    except AttributeError:
+        return False
 
 
 def do_map(m, points):