From c3d35d2733d1f24827aa24fa7921a259befa5a3e Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 6 Jul 2025 09:10:31 +0530
Subject: [PATCH] Tag browser: Fix clicking on categories to search for books
 by first letter of series not working correctly for non-English language
 books. Fixes #2116006 [Series filtering misbehaves with
 articles](https://bugs.launchpad.net/calibre/+bug/2116006)

---
 src/calibre/db/fields.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/db/fields.py b/src/calibre/db/fields.py
index 53696bade8..8f6f1db2b3 100644
--- a/src/calibre/db/fields.py
+++ b/src/calibre/db/fields.py
@@ -768,7 +768,7 @@ class SeriesField(ManyToOneField):
                 for book_id in book_ids:
                     lang = lang_map.get(book_id)
                     if lang:
-                        lang_counts[lang[0]] += 1
+                        lang_counts[lang] += 1
                 lang = lang_counts.most_common(1)[0][0] if lang_counts else None
                 yield ts(val, order=sso, lang=lang), book_ids