From dc4f752ffb4d927ef5c5a731f34edd716d964da3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 23 Nov 2020 15:41:58 +0530
Subject: [PATCH] Fix #1905257 [ebook-viewer: "Not a unicode string" when
 searching table of contents](https://bugs.launchpad.net/calibre/+bug/1905257)

---
 src/calibre/gui2/viewer/toc.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/viewer/toc.py b/src/calibre/gui2/viewer/toc.py
index 9fdeee69b4..78fbaf2bcf 100644
--- a/src/calibre/gui2/viewer/toc.py
+++ b/src/calibre/gui2/viewer/toc.py
@@ -219,7 +219,8 @@ class TOC(QStandardItemModel):
 
     def find_items(self, query):
         for item in self.all_items:
-            if primary_contains(query, item.text()):
+            text = item.text()
+            if text and primary_contains(query, text):
                 yield item
 
     def node_id_for_text(self, query):