I merged the latest changes on master branch and i get this error:

Fatal error: JApplicationCms::getUserState(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "Joomla\Registry\Registry" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/fastslack/www/mets/libraries/cms/application/cms.php on line 506