Error

Got this error. Please advise. Thank you

WordPress version 5.8
Current plugin: Sermon Manager for WordPress (version 2.16.8)
PHP version 8.0.2

Error Details
=============
An error of type E_ERROR was caused in line 627 of the file /home/hmccwp/jakarta/wp-content/plugins/sermon-manager-for-wordpress/sermons.php. Error message: Uncaught TypeError: count(): Argument #1 ($var) must be of type Countable|array, bool given in /home/hmccwp/jakarta/wp-content/plugins/sermon-manager-for-wordpress/sermons.php:627
Stack trace:
#0 /home/hmccwp/jakarta/wp-includes/class-wp-hook.php(305): SermonManager->{closure}(1963)
#1 /home/hmccwp/jakarta/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
#2 /home/hmccwp/jakarta/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#3 /home/hmccwp/jakarta/wp-includes/post.php(3207): do_action('before_delete_p...', 1963, Object(WP_Post))
#4 /home/hmccwp/jakarta/wp-includes/revision.php(458): wp_delete_post(1963)
#5 /home/hmccwp/jakarta/wp-admin/edit-form-blocks.php(209): wp_delete_post_revision(1963)
#6 /home/hmccwp/jakarta/wp-admin/post.php(187): require('/home/hmccwp/ja...')
#7 {main}
  thrown