WCF::handleException() Unhandled exception: syntax error, unexpected token "{", expecting ")"

#0 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/util/UserUtil.class.php(105): wcf\system\WCF::autoload('wcf\\util\\String...')
#1 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/system/session/SessionHandler.class.php(336): wcf\util\UserUtil::getUserAgent()
#2 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/system/session/SessionHandler.class.php(138): wcf\system\session\SessionHandler->create()
#3 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/system/session/ACPSessionFactory.class.php(28): wcf\system\session\SessionHandler->load('wcf\\data\\sessio...', '')
#4 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/system/WCF.class.php(345): wcf\system\session\ACPSessionFactory->load()
#5 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/lib/system/WCF.class.php(143): wcf\system\WCF->initSession()
#6 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/wcf/global.php(25): wcf\system\WCF->__construct()
#7 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/global.php(13): require_once('/var/www/vhosts...')
#8 /var/www/vhosts/web410.webbox443.server-home.org/html/kmxforum/index.php(9): require_once('/var/www/vhosts...')
#9 {main}