Bug mail dns error after 2.3

[estranged]

Hello,

After upgrading to 2.3 I am having the error below in error logs. Any suggestions?

Thanks.

Code:

TypeError: Symfony\Component\Mailer\Transport\Dsn::__construct(): Argument #5 ($port) must be of type ?int, string given, called in /home/x/public_html/src/XF/Mail/Mailer.php on line 348 src/vendor/symfony/mailer/Transport/Dsn.php:28

#0 src/XF/Mail/Mailer.php(348): Symfony\Component\Mailer\Transport\Dsn->__construct('smtp', 'smtp.mailgun.or...', 'postmaster@turk...', '*****', '')
#1...

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