Issue #3012055 by alex_optim, Eric_A: Broken hook_help() implementation.

<?php

use Drupal\Core\Routing\RouteMatchInterface;

/**

 * Implements hook_help().

 */

function riddler_help($path, $arg) {

  switch ($path) {

    case 'admin/config/people/riddler':

function riddler_help($route_name, RouteMatchInterface $route_match) {

  switch ($route_name) {

    case 'help.page.riddler':

      $output = '<p>' . t('Requires anonymous users completing forms to answer a simple question to counter spam.') . '</p>';

      return $output;

  }