diff --git a/src/cas/atrium-sud.js b/src/cas/atrium-sud.js
index c508a3d3..77c38de3 100644
--- a/src/cas/atrium-sud.js
+++ b/src/cas/atrium-sud.js
@@ -11,7 +11,7 @@ async function login(url, account, username, password)
 
     let lt = dom.window.document.getElementsByName('lt');
     let execution = dom.window.document.getElementsByName('execution');
-    lt = lt[0].value;
+    lt = lt[0]?.value;
     execution = execution[0].value;
 
     dom = await getDOM({