diff --git a/pandora_console/include/rest-api/models/VisualConsole/Item.php b/pandora_console/include/rest-api/models/VisualConsole/Item.php
index c391917731..7da6e26426 100644
--- a/pandora_console/include/rest-api/models/VisualConsole/Item.php
+++ b/pandora_console/include/rest-api/models/VisualConsole/Item.php
@@ -1072,8 +1072,8 @@ class Item extends CachedModel
         $mobile_navigation = false;
 
         if (isset($_SERVER['PHP_SELF']) === true
-            && (strstr($_SERVER['PHP_SELF'], 'mobile/') !== false
-            || strstr($_SERVER['HTTP_REFERER'], 'mobile/') !== false)
+            && (strstr(($_SERVER['PHP_SELF'] ?? ''), 'mobile/') !== false
+            || strstr(($_SERVER['HTTP_REFERER'] ?? ''), 'mobile/') !== false)
         ) {
             $mobile_navigation = true;
         }