a.php

public function add($request, $response, $args) {
    $user = $request->getParsedBody();

    if(!$user) {
      throw new \Exception('Failed to add user: $user is null');
      return;
    }

    $validator = \API\Validators\UserRegistration::validate();
    $this->logger->info('User:', [$user]);

    try {
      $validator->assert($user);
    } catch (NestedValidationException $e) {
      $this->logger->warning('Validation Failed!', [$e]);
      
      $errors = $e->findMessages([
        'snapchat_name' => 'Enter a valid snapchat name',
        'age' => 'You must be over 18',
        'gender' => 'Are you an alien?',
        'password' => 'Enter a secure password',
        'country' => 'Select your country of residence'
      ]);

      return $response
        ->withStatus(200)
        ->withJson([
          "success" => false,
          "errors" => $errors
        ]);
    }

gistfile1.txt

[2018-09-26 23:00:06] slim.ERROR: Application Error: ["[object] (Exception(code: 0): Failed to add user: $user is null at /var/www/html/src/Controllers/User.php:63)"] []