From db13d8e561d1595bf731a1a90c4dc8138c0a9636 Mon Sep 17 00:00:00 2001
From: Tjeu Kayim <15987676+TjeuKayim@users.noreply.github.com>
Date: Sun, 22 Sep 2019 14:27:14 +0200
Subject: [PATCH] Log HtmlConfig deserialization errors

---
 src/config.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/config.rs b/src/config.rs
index 17c941d2..02452447 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -62,6 +62,7 @@ use toml_query::insert::TomlValueInsertExt;
 use toml_query::read::TomlValueReadExt;
 
 use crate::errors::*;
+use crate::utils;
 
 /// The overall configuration object for MDBook, essentially an in-memory
 /// representation of `book.toml`.
@@ -168,7 +169,13 @@ impl Config {
     /// HTML renderer is refactored to be less coupled to `mdbook` internals.
     #[doc(hidden)]
     pub fn html_config(&self) -> Option<HtmlConfig> {
-        self.get_deserialized("output.html").ok()
+        match self.get_deserialized("output.html") {
+            Ok(config) => Some(config),
+            Err(e) => {
+                utils::log_backtrace(&e.chain_err(|| "Parsing configuration [output.html]"));
+                None
+            }
+        }
     }
 
     /// Convenience function to fetch a value from the config and deserialize it