From 2016948119b4f4116eac3095aee6eaf55765e9a7 Mon Sep 17 00:00:00 2001
From: Gabriel Augendre <gabriel@augendre.info>
Date: Sat, 2 Jun 2018 09:52:04 +0200
Subject: [PATCH] Don't try to listen to selector events if selector doesn't
 exist

---
 manuels/static/manuels/no_book.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/manuels/static/manuels/no_book.js b/manuels/static/manuels/no_book.js
index ea762d7..5df85ea 100644
--- a/manuels/static/manuels/no_book.js
+++ b/manuels/static/manuels/no_book.js
@@ -1,5 +1,6 @@
 document.addEventListener("DOMContentLoaded", function (event) {
     var _selector = document.querySelector('#id_no_book');
+    if (_selector === null) return;
     _selector.addEventListener('change', function (event) {
         if (_selector.checked) {
             document.querySelector('#id_title').value = "PAS DE LIVRE POUR CETTE CLASSE";