From 19c4afd22212c34a1da81e400806a8d1675c8952 Mon Sep 17 00:00:00 2001
From: Charles Haley <>
Date: Sun, 19 Dec 2010 09:53:12 +0000
Subject: [PATCH] Fix #7949: Plug Board vs Series metadata change - bad
 behavior in 0.7.34

---
 src/calibre/ebooks/metadata/book/base.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/ebooks/metadata/book/base.py b/src/calibre/ebooks/metadata/book/base.py
index f0844e3711..22752ca09e 100644
--- a/src/calibre/ebooks/metadata/book/base.py
+++ b/src/calibre/ebooks/metadata/book/base.py
@@ -463,6 +463,8 @@ class Metadata(object):
         other_lang = getattr(other, 'language', None)
         if other_lang and other_lang.lower() != 'und':
             self.language = other_lang
+        if not getattr(self, 'series', None):
+            self.series_index = None
 
     def format_series_index(self, val=None):
         from calibre.ebooks.metadata import fmt_sidx