From 4b6ec8cffa8044c435f8731ac527d2db717f452d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Benedikt=20R=C3=B6tsch?= <benedikt@contentful.com>
Date: Fri, 2 Feb 2018 14:37:23 +0100
Subject: [PATCH] fix(errors): detect non-existing lessons

---
 routes/courses.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/routes/courses.js b/routes/courses.js
index 3571593..e94b67b 100644
--- a/routes/courses.js
+++ b/routes/courses.js
@@ -119,6 +119,12 @@ module.exports.getLesson = async (request, response, next) => {
   const lessons = course.fields.lessons
   let {lesson, nextLesson} = getNextLesson(lessons, request.params.lslug)
 
+  if (!lesson) {
+    const error = new Error('Lesson does not exist')
+    error.status = 404
+    throw error
+  }
+
   // Save visited lessons
   const cookie = request.cookies.visitedLessons
   let visitedLessons = cookie || []