Uncaught TypeError when editing user with custom role

I’m seeing the following fatal error on PHP 8.0 when attempting to edit a user with multiple custom roles assigned via https://ww.wp.xz.cn/plugins/members/ Deactivating BNFW allows me to edit users as expected.

PHP Fatal error:  Uncaught TypeError: Illegal offset type in isset or empty in wp-includes/plugin.php:176
Stack trace:
#0 wp-content/plugins/bnfw/bnfw.php(1184): apply_filters()
#1 [internal function]: BNFW->bnfw_members_sanitize_role()
#2 wp-content/plugins/bnfw/bnfw.php(1130): array_map()
#3 wp-includes/class-wp-hook.php(309): BNFW->user_role_added()
#4 wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#5 wp-includes/plugin.php(476): WP_Hook->do_action()
#6 wp-includes/user.php(2432): do_action()
#7 wp-includes/user.php(2553): wp_insert_user()
#8 wp-admin/includes/user.php(227): wp_update_user()
#9 wp-admin/user-edit.php(167): edit_user()
#10 {main}
  thrown in wp-includes/plugin.php on line 176