PHPMailer does not execute code after $mail = new PHPMailer - php

Question

I have made a website on my localhost. After everything was ready to go I hosted the website. However, now PHPMailer seems to cause the trouble. Mails are not sending and it seems like PHP code does not execute after $mail = new PHPMailer command. Here is part of the code:
if($conn->query($sql)){
require_once '/home/ziptie/public_html/PHPMailerAutoload.php';
$mail = new PHPMailer;
$mail->SMTPDebug = true;
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'smtp.gmail.com'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'mygmail#gmail.com'; // your email id
$mail->Password = 'mypassword'; // your password
$mail->SMTPSecure = 'tls';
$mail->Port = 587; //587 is used for Outgoing Mail (SMTP) Server.
$mail->setFrom('mygmail#gmail.com', 'ZIPTIE');
$mail->addAddress($email); // Add a recipient
$mail->isHTML(true); // Set email format to HTML
$v="http://ziptie.rs/verification-page.php?sifra=$token";
$body = file_get_contents('/home/ziptie/public_html/verificationemail.html');
$body = str_replace('promenljiva', $v, $body);
$mail->Subject = 'Verifikacija kupca, ZIPTIE';
$mail->Body = $body;
$mail->addAttachment("naruzbine ".date("d-m-Y").".zip");
$mail->send();
header("Refresh:0; url=https://www.ziptie.rs/verification-page.php");
//echo '<script>alert("Verifikacioni link je poslat, proverite Vašu mejl adresu.")</script>';
/*if(!$mail->send()) {
echo 'Message was not sent.';
echo 'Mailer error: ' . $mail->ErrorInfo;
} else {
echo 'Message has been sent.';
}*/
}
else{
echo $conn->error;
}
Does anybody know the solution? Thanks!

Answer 1

found solution in upgrading to PHPMailer 6.3