Cannot access settings anymore

Hello,
I’ve installed Passter and everything worked great.
But since a couple of weeks, I am not able to access the Passter settings anymore. Whenever I click on “Skip” on the page where it suggests I install freemius.com, the next page won’t load and I get stuck on that page.
And clicking on Activate result in a Fatal Error (see below).
What to do?
Thanks!
Mat

Fatal error: Uncaught Error: Call to undefined method stdClass::has_trial() in /srv/disk14/3124340/www/ikaros.eu5.net/wp-content/plugins/content-protector/inc/freemius/includes/managers/class-fs-plan-manager.php:155 Stack trace: #0 /srv/disk14/3124340/www/ikaros.eu5.net/wp-content/plugins/content-protector/inc/freemius/includes/class-freemius.php(19491): FS_Plan_Manager->has_trial_plan(Array) #1 /srv/disk14/3124340/www/ikaros.eu5.net/wp-includes/class-wp-hook.php(286): Freemius->_check_for_trial_plans(Array) #2 /srv/disk14/3124340/www/ikaros.eu5.net/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array) #3 /srv/disk14/3124340/www/ikaros.eu5.net/wp-includes/plugin.php(465): WP_Hook->do_action(Array) #4 /srv/disk14/3124340/www/ikaros.eu5.net/wp-content/plugins/content-protector/inc/freemius/includes/class-freemius.php(16064): do_action('fs_after_plans_...', Object(stdClass)) #5 /srv/disk14/3124340/www/ikaros.eu5.net/wp-content/plugins/content-protector/inc/freemius/includes/class-freemius.php(9944): Freemius- in /srv/disk14/3124340/www/ikaros.eu5.net/wp-content/plugins/content-protector/inc/freemius/includes/managers/class-fs-plan-manager.php on line 155