Serialization error when sending email

s3mp

I'm on a VPS with PHP Version 5.6.22-0+deb8u1

I put the right SMTP settings but when Flarum tries to send an email, I get this in my log file:

[07-Oct-2016 13:26:57 UTC] PHP Notice: Serialization of closure failed: You cannot serialize or unserialize PDO instances in .../htdocs/vendor/jeremeamia/SuperClosure/src/SerializableClosure.php on line 117 [07-Oct-2016 13:26:57 UTC] PHP Fatal error: Call to a member function push() on null in .../htdocs/vendor/illuminate/mail/Mailer.php on line 195

Does this come from a hosting restriction?

Otherwise everything works as it should.

Thanks.

cristic

Being a php fatal error it's code related for me... I don't know if this can help, but... just an idea ? (also it's also a Laravel-related issue)

s3mp

I'll try to update to Beta 6 but I doubt it will change something...