Fatal error when used with members plugin

Fatal error: Uncaught TypeError: Illegal offset type in isset or empty in /var/www/domain.com/wp-includes/plugin.php:174 Stack trace:
#0 /var/www/domain.com/wp-content/plugins/bnfw/bnfw.php(1184): apply_filters()
#1 [internal function]: BNFW->bnfw_members_sanitize_role()
#2 /var/www/domain.com/wp-content/plugins/bnfw/bnfw.php(1130): array_map()
#3 /var/www/domain.com/wp-includes/class-wp-hook.php(309): BNFW->user_role_added()
#4 /var/www/domain.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#5 /var/www/domain.com/wp-includes/plugin.php(474): WP_Hook->do_action()
#6 /var/www/domain.com/wp-includes/user.php(2283): do_action()
#7 /var/www/domain.com/wp-includes/user.php(2404): wp_insert_user()
#8 /var/www/domain.com/wp-admin/includes/user.php(227): wp_update_user()
#9 /var/www/domain.com/wp-admin/user-edit.php(166): edit_user()
#10 {main} thrown in /var/www/domain.com/wp-includes/plugin.php on line 174

The apply_filters function requires a string as first parameter to identify the filter. Line 1184 in bnfw.php has an array as first parameter.