diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index c255ae3..f4fceb0 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -106,7 +106,7 @@ class Application extends App implements IBootstrap
 
     protected function isEnabled(): bool
     {
-        if (preg_match('/MemoriesNative/', $_SERVER['HTTP_USER_AGENT'])) {
+        if (isset($_SERVER["HTTP_USER_AGENT"]) && preg_match('/MemoriesNative/', $_SERVER['HTTP_USER_AGENT'])) {
             return false;
         }