debug notice

It seems that the plugin does not fully support Japanese UI.
The number of administrator is shown as ‘1 xx’. It cannot be recognized as a number.

PHP Notice: A non well formed numeric value encountered in \wp-content\plugins\user-role-editor\includes\classes\protect-admin.php on line 216
PHP Stack trace:
PHP 1. {main}() \wp-admin\users.php:0
PHP 2. WP_Users_List_Table->views() \wp-admin\users.php:506
PHP 3. apply_filters($tag = *uninitialized*, $value = *uninitialized*) \wp-admin\includes\class-wp-list-table.php:375
PHP 4. WP_Hook->apply_filters($value = *uninitialized*, $args = *uninitialized*) \wp-includes\plugin.php:203
PHP 5. URE_Protect_Admin->exclude_admins_view($views = *uninitialized*) \wp-includes\class-wp-hook.php:286