2017/05/23 16:34:51 [error] 1117#0: *5999 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'RuntimeException' with message 'Failed to start the session: already started by PHP.' in /srv/domain.com/agendav2/web/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:131
Stack trace:
#0 /srv/domain.com/agendav2/web/vendor/symfony/http-foundation/Session/Session.php(71): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start()
#1 /srv/domain.com/agendav2/web/vendor/symfony/security/Csrf/TokenStorage/SessionTokenStorage.php(90): Symfony\Component\HttpFoundation\Session\Session->start()
#2 /srv/domain.com/agendav2/web/vendor/symfony/security/Csrf/CsrfTokenManager.php(54): Symfony\Component\Security\Csrf\TokenStorage\SessionTokenStorage->hasToken('lkjihgfedcba')
#3 /srv/domain.com/agendav2/web/src/Csrf.php(75): Symfony\Component\Security\Csrf\CsrfTokenManager->getToken('lkjihgfedcba')
#4 /srv/domain.com/agendav2/web/app/app.php(41): AgenDAV\Csrf::getCurrentToken(Object(Silex\Application))
#5 /srv/domain" while reading response header from upstream, client: 10.0.0.34, server: agendav2.domain.com, request: "GET / HTTP/1.0", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:"