Multiple primary key defined for query ALTER TABLE

Hi,
I received the following WordPress error message:

[Tue Mar 24 15:12:00.292672 2015] [:error] [pid x] [client ip address:number] WordPress database error Multiple primary key defined for query ALTER TABLE wp_yith_wcwl ADD PRIMARY KEY ( ID ) made by require_once(‘wp-admin/admin.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘init’), call_user_func_array, YITH_WCWL_Install->update, YITH_WCWL_Install->_add_tables, YITH_WCWL_Install->_add_items_table, dbDelta

Does anyone know what this error is and how to fix it?

Thanks!