diff --git a/resources/assets/javascripts/bootstrap/fullscreen.js b/resources/assets/javascripts/bootstrap/fullscreen.js
index e83e8273991b58ee8822d6ec22e2f1ec52e197fb..56becd63d21ee6c621342a7a1ac0be5a7fde2fe5 100644
--- a/resources/assets/javascripts/bootstrap/fullscreen.js
+++ b/resources/assets/javascripts/bootstrap/fullscreen.js
@@ -1,10 +1,10 @@
 STUDIP.ready(() => {
-    document.getElementById('fullscreen-on').addEventListener('click', event => {
+    document.getElementById('fullscreen-on')?.addEventListener('click', event => {
         event.preventDefault();
         STUDIP.Vue.emit('toggle-compact-navigation', true);
     });
 
-    document.getElementById('fullscreen-off').addEventListener('click', event => {
+    document.getElementById('fullscreen-off')?.addEventListener('click', event => {
         event.preventDefault();
         STUDIP.Vue.emit('toggle-compact-navigation', false);
     })