diff --git a/lib/Cleantalk.php b/lib/Cleantalk.php
index 04a57e6..4c3ee72 100644
--- a/lib/Cleantalk.php
+++ b/lib/Cleantalk.php
@@ -411,7 +411,7 @@ private function httpRequest($msg) {
 		
         $si=(array)json_decode($msg->sender_info,true);
 
-		$si['remote_addr'] = $_SERVER['REMOTE_ADDR'];
+		if(isset($_SERVER['REMOTE_ADDR']))     $si['remote_addr'] = $_SERVER['REMOTE_ADDR'];
 		if(isset($_SERVER['X_FORWARDED_FOR'])) $msg->x_forwarded_for = $_SERVER['X_FORWARDED_FOR'];
 		if(isset($_SERVER['X_REAL_IP']))       $msg->x_real_ip       = $_SERVER['X_REAL_IP'];