errors

if i open notification settings of this plugin i get

Notice: Trying to access array offset on value of type bool in /www/htdocs/w01ab825/hotel-erb.de/wp-content/plugins/aryo-activity-log/classes/class-aal-settings.php on line 168

Warning: Cannot modify header information – headers already sent by (output started at /www/htdocs/w01ab825/hotel-erb.de/wp-content/plugins/aryo-activity-log/classes/class-aal-settings.php:168) in /www/htdocs/w01ab825/hotel-erb.de/wp-admin/includes/misc.php on line 1282

Warning: Cannot modify header information – headers already sent by (output started at /www/htdocs/w01ab825/hotel-erb.de/wp-content/plugins/aryo-activity-log/classes/class-aal-settings.php:168) in /www/htdocs/w01ab825/hotel-erb.de/wp-admin/admin-header.php on line 9