From 48db5f1b8b467b2e1f6a43988c4853025f71bd40 Mon Sep 17 00:00:00 2001
From: Johan Preynat <johan.preynat@gmail.com>
Date: Sat, 4 Jun 2016 15:42:31 +0200
Subject: [PATCH] Fix detecting chapters when summary item doesn't contain a
 link

---
 src/js/theme/navigation.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/js/theme/navigation.js b/src/js/theme/navigation.js
index a16d199..b698c4c 100644
--- a/src/js/theme/navigation.js
+++ b/src/js/theme/navigation.js
@@ -289,7 +289,15 @@ function preparePage(resetScroll) {
     $chapters = $('.book-summary .summary .chapter')
     .filter(function() {
         var $link = $(this).children('a'),
-            href =  $link.attr('href').split('#')[0];
+            href  = null;
+
+        // Chapter doesn't have a link
+        if (!$link.length) {
+            return false;
+        }
+        else {
+            href = $link.attr('href').split('#')[0];
+        }
 
         var resolvedRef = url.resolve(window.location.pathname, href);
         return window.location.pathname == resolvedRef;
-- 
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