PHP Fatal Error on site cloning

Hey,

I am getting the following PHP error on a local WordPress 5.4 multisite installation when cloning with selected tables and post types:

PHP Fatal error:  Uncaught ArgumentCountError: Too few arguments to function wsmInitPlugin::wsmCreateDatabaseSchemaForNewSite(), 1 passed in /wp-includes/class-wp-hook.php on line 289 and exactly 6 expected in /wp-content/plugins/wp-stats-manager/includes/wsm_init.php:1575
Stack trace:
#0 /wp-includes/class-wp-hook.php(289): wsmInitPlugin::wsmCreateDatabaseSchemaForNewSite(8)
#1 /wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters('', Array)
#2 /wp-includes/plugin.php(544): WP_Hook->do_action(Array)
#3 /wp-includes/plugin.php(660): do_action_ref_array('wpmu_new_blog', Array)
#4 in /wp-content/plugins/wp-stats-manager/includes/wsm_init.php on line 1575, referer: https://host.local/wp-admin/network/admin.php?page=ns-cloner

Also, requesting /wp-admin/admin-ajax.php?flag=ns_cloner_process_init returns 500 but I am just receiving these two bits of information.

Weirdly, this happens since I installed NS Cloner Pro. Before, with the free version, the cloning went well but I need the Pro version for better controlling which contents are cloned.

Regards,
Babette