Error from plugin

I’m getting the following error when I deactivated and reactivated all my plugins and can’t access plugins anymore:

Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, bool given in /srv/disk1/2533442/www/shedidit/wp-content/plugins/master-addons/inc/admin/promotions.php on line 304

Fatal error: Uncaught Error: Call to a member function format() on bool in /srv/disk1/2533442/www/shedidit/wp-content/plugins/master-addons/inc/admin/promotions.php:231 Stack trace: #0 /srv/disk1/2533442/www/shedidit/wp-content/plugins/master-addons/inc/admin/promotions.php(305): MasterAddons\Admin\Promotions\Master_Addons_Promotions->jltma_get_total_interval(false, 'days') #1 /srv/disk1/2533442/www/shedidit/wp-content/plugins/master-addons/inc/admin/promotions.php(398): MasterAddons\Admin\Promotions\Master_Addons_Promotions->jltma_days_differences() #2 /srv/disk1/2533442/www/shedidit/wp-includes/class-wp-hook.php(287): MasterAddons\Admin\Promotions\Master_Addons_Promotions->jltma_request_review_after_seven_days('') #3 /srv/disk1/2533442/www/shedidit/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #4 /srv/disk1/2533442/www/shedidit/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #5 /srv/disk1/2533442/www/shedidit/wp-admin/admin-header.php(292): do_action('admin_notices') #6 /srv/disk1/253344 in /srv/disk1/2533442/www/shedidit/wp-content/plugins/master-addons/inc/admin/promotions.php on line 231
There has been a critical error on this website.

Thanks for your help!