Warning: Undefined array key search_page, WordPress database error

Fresh install, Newsletter Dashboard -> top menu Subscribers -> All Subscribers:

Warning: Undefined array key "search_page" in ../wp-content/plugins/newsletter/users/index.php on line 110

One subscriber is shown in list, obviously added plugin onboarding.

When I delete this subscriber:

WordPress database error. You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '-20,20' at line 1 for query select *, unix_timestamp(created) created_at from wp_newsletter where 1=1 order by id desc limit -20,20 made by do_action('newsletter_page_newsletter_users_index'), WP_Hook->do_action, WP_Hook->apply_filters, NewsletterModuleAdmin->menu_page, require('/plugins/newsletter/users/index.php')

Newsletter 8.9.0