php - Call to a member function execute() on boolean in

My html :

 

        Email : 
        Message : 
                

    

My rent.php file :

 require_once 'login.php';
   $conn = new mysqli($hn, $un, $pw, $db);
   if ($conn->connect_error) {
    die($conn->connect_error);

}
    $query = "SET NAMES utf8";
    $result = $conn->query($query);
    if (!$result) {
        die($conn->error);
    }

    $req = $conn->prepare('INSET INTO renter (email, msg_text) VALUES(?, ?)');
    $req->execute(array($_POST['email'], $_POST['msg_text']));


    header('Location: menu.php');

My error when I try to submit, is : Fatal error: Call to a member function execute() on boolean in C:...\rent.php on line 18

email, msg_text are in varchar type

Answer

mysqli->prepare can also return FALSE (check http://php.net/manual/en/mysqli.prepare.php) if an error occurred. Your problem is that you have INSET instead of INSERT.