From 9e163b2f662d3de0e74730c08f1d2142435d6571 Mon Sep 17 00:00:00 2001
From: Tom Reijnders <reijnders@tor.nl>
Date: Mon, 28 Aug 2023 18:51:29 +0200
Subject: [PATCH] Prevent error in PHP log

---
 lti_launch.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lti_launch.php b/lti_launch.php
index 1eb288839..090f7d9e8 100644
--- a/lti_launch.php
+++ b/lti_launch.php
@@ -183,7 +183,7 @@
         $_SESSION['XAPI_PROXY'] = $lrs;
     }
 
-    if ($_GET['x_embed'] === 'true') {
+    if (isset($_GET['x_embed']) && $_GET['x_embed'] === 'true') {
         $x_embed = true;
         if ($_GET['activated'] !== 'true') {
             $lti_enabled = false;