Uncaught TypeError: array_merge(): Argument #2 must be of type array

Hello,

I’m using PHP 8.1.6 and OpenLiteSpeed, and I have a PHP Fatal Error after installing and configuring this plugin.
The error is happening on the dashboard admin WP page.

Error Level: E_ERROR

Message: Uncaught TypeError: array_merge(): Argument #2 must be of type array, string given in /var/www/website(dot)com/htdocs/wp-content/plugins/index-wp-users-for-speed/admin/user-handler.php:678

Stack trace:

#0 /var/www/website(dot)com/htdocs/wp-content/plugins/index-wp-users-for-speed/admin/user-handler.php(678): array_merge()

#1 /var/www/website(dot)com/htdocs/wp-content/plugins/index-wp-users-for-speed/admin/user-handler.php(703): IndexWpUsersForSpeed\UserHandler->getRoleFilterSets()

#2 /var/www/website(dot)com/htdocs/wp-content/plugins/index-wp-users-for-speed/admin/user-handler.php(565): IndexWpUsersForSpeed\UserHandler->mungRoleFilters()

#3 /var/www/website(dot)com/htdocs/wp-includes/class-wp-hook.php(308): IndexWpUsersForSpeed\UserHandler->action__pre_get_users()

#4 /var/www/website(dot)com/htdocs/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()

#5 /var/www/website(dot)com/htdocs/wp-includes/plugin.php(565): WP_Hook->do_action()

#6 /var/www/website(dot)com/htdocs/wp-includes/class-wp-user-query.php(277): do_action_ref_array()

#7 /var/www/website(dot)com/htdocs/wp-includes/class-wp-user-query.php(78): WP_User_Query->prepare_query()

#8 /var/www/website(dot)com/htdocs/wp-content/plugins/when-last-login/when-last-login.php(395): WP_User_Query->__construct()

#9 /var/www/website(dot)com/htdocs/wp-admin/includes/template.php(1409): When_Last_Login::admin_dashboard_widget_display()

#10 /var/www/website(dot)com/htdocs/wp-admin/includes/dashboard.php(271): do_meta_boxes()

#11 /var/www/website(dot)com/htdocs/wp-admin/index.php(203): wp_dashboard()

#12 {main}

thrown

File: /var/www/website(dot)com/htdocs/wp-content/plugins/index-wp-users-for-speed/admin/user-handler.php

Line: 678