Fatal error: Uncaught Exception: Serialization of 'Closure' is not allowed in /code/vendor/magento/framework/Session/SessionManager.php:133
Stack trace:
#0 /code/vendor/magento/framework/Session/SessionManager.php(133): session_write_close()
#1 [internal function]: Magento\Framework\Session\SessionManager->writeClose()
#2 {main}
thrown in /code/vendor/magento/framework/Session/SessionManager.php on line 133