diff --git a/src/TrackingRules.php b/src/TrackingRules.php
index 02d0505..9e09f84 100644
--- a/src/TrackingRules.php
+++ b/src/TrackingRules.php
@@ -13,7 +13,7 @@ public function __construct(WordPressSettings $settings)
 
     public function hasExcludedIp(): bool
     {
-        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'] ?? $_SERVER['REMOTE_ADDR'];
+        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'] ?? ($_SERVER['REMOTE_ADDR'] ?? null);
 
         if (empty($ip)) return false;