undefined index REMOTE ADDR when running newsletter cron.php

THIS IS MY LINE OF CODE IN APPKERNEL PHP

<?php
   use Symfony\Component\Debug\Debug;
   $tempuri = ltrim($_SERVER['REQUEST_URI'],'/');
   $tempuri = explode('/',$tempuri);
   if(strpos($tempuri[0],'~') !== false){
   $fixurlbase = "/{$tempuri[0]}/";
   }else{
   $fixurlbase = "/";
   }

/*** Composer ***/
include __DIR__ . "/../vendor/autoload.php";

/**** Debug ****/
if($_SERVER['HTTP_X_FORWARDED_FOR'] == "84.228.79.100" || $_SERVER['REMOTE_ADDR'] == "82.81.17.192" 
|| $_SERVER['REMOTE_ADDR'] == "82.81.40.186" || $_SERVER['REMOTE_ADDR'] == "127.0.0.1"){
DEFINE("DEBUG",1);
}else{
 DEFINE("DEBUG",0);
}
Copy code

I keep getting this error I don't know why I tried to run cron for a newsletter

this is the errors

enter image description here

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