Php page just blank no error and not storing data to db

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PHP

This is the php script

<?php

if(isset($_POST['name'])){
$yourName = $_POST['name'];
}

if(isset($_POST['email'])){
$yourEmail = $_POST['email'];
}

if(isset($_POST['comment'])){
$yourComment = $_POST['comment'];
}

$conn = new mysqli('localhost', 'root', '','regisdata');

if($conn->connect_error){
    die('Connection Failed : ' .$conn->connect_error);
}
else
{
    $stmt = $conn->prepare("INSERT INTO guest_records('name', 'email', 'comment') VALUES (?, ?, ?)");
    
        if($stmt !== FALSE)
        {
            $stmt->bind_param("sss", $yourName, $yourEmail, $yourComment);
            $stmt->execute();
            $stmt->close();
            $conn->close();
            header("Location: guestbook.php?Success");
        }
}

?>

What I have tried:

I have other project that already working using that php code but it bothers me it doesn't work on this project. When i click the submit just a blank php page and no errors and it suppose to return to the form.