Fatal Error after update

Hey Folks,

just made an update on my website http://planz-studienberatung.com/ and after it i got this Message:

Fatal error: Uncaught Error: __clone method called on non-object in […]/wp-content/plugins/rating-widget/freemius/includes/class-freemius.php:6752 Stack trace: #0 […]/wp-content/plugins/rating-widget/freemius/includes/class-freemius.php(333): Freemius->_load_account() #1 […]/wp-content/plugins/rating-widget/freemius/includes/class-freemius.php(957): Freemius->__construct(‘rating-widget’, true) #2 […]/wp-content/plugins/rating-widget/freemius/start.php(299): Freemius::instance(‘rating-widget’, true) #3 […]/wp-content/plugins/rating-widget/rating-widget.php(6555): fs_dynamic_init(Array) #4 […]/wp-content/plugins/rating-widget/rating-widget.php(6680): rw_fs() in […]/wp-content/plugins/rating-widget/freemius/includes/class-freemius.php on line 6752

Any Idea how to rescue the Website?