Phalcon 1.2.6: $dispatcher->getControllerName() not returning a string?

index.php

<?php
// /public/index.php
try {

    // Read the configuration
    $config = new Phalcon\Config\Adapter\Ini('../app/config/config.ini');

    // Register an autoloader
    $loader = new Phalcon\Loader();
    $loader->registerDirs(array(
        $config->application->controllersDir,
        $config->application->modelsDir,
        $config->application->pluginsDir
    ));

    $loader->register();

    // Create a DI
    $di = new Phalcon\DI\FactoryDefault();

    // Setup the view component
    $di->set('view', function () use ($config) {
        $view = new Phalcon\Mvc\View();
        $view->setViewsDir($config->application->viewsDir);
        $view->registerEngines(array(
            '.volt' => 'volt'
            //'.volt' => 'Phalcon\Mvc\View\Engine\Volt'
        ));
        return $view;
    });

    // Set up volt templating
    $di->set('volt', function ($view, $di) use ($config) {
        $volt = new Phalcon\Mvc\View\Engine\Volt($view, $di);
        $volt->setOptions(array(
            'compiledPath' => $config->application->cacheDir.'volt/'
        ));
        return $volt;
    });

    // Setup a base URI so that all generated URIs include the 'phalcon' folder
    $di->set('url', function () use ($config) {
        $url = new Phalcon\Mvc\Url();
        $url->setBaseUri($config->application->baseUri);
        return $url;
    });

    // Register the events manager
    $di->set('dispatcher', function () use ($di) {

        // Obtain the standard eventsManager from the DI
        $eventsManager = new Phalcon\Events\Manager();
        $dispatcher = new Phalcon\Mvc\Dispatcher();

        // Attach a listener for type "dispatch"
        $eventsManager->attach('dispatch', function ($event, $dispatcher) {
            $controllerName = Phalcon\Text::camelize($dispatcher->getControllerName());
            $dispatcher->setControllerName($controllerName);

            $actionName = Phalcon\Text::camelize($dispatcher->getActionName());
            $dispatcher->setActionName($actionName);
        });

        // Bind the EventsManager to the Dispatcher
        $dispatcher->setEventsManager($eventsManager);

        return $dispatcher;
    });

    // Register route patterns
    $di->set('router', function () {
        $router = new Phalcon\Mvc\Router(false);
        $router->add('/:controller', array(
            'controller' => 1
        ));
        $router->add('/:controller/([a-zA-Z\-]+)/:params', array(
            'controller' => 1,
            'action' => 2,
            'params' => 3
        ));
        return $router;
    });

    // Handle the request
    $application = new Phalcon\Mvc\Application($di);

    echo $application->handle()->getContent();
} catch (Phalcon\Excpetion $e) {
    echo 'PhalconException: ', $e->getMessage();
} catch (PDOException $e) {
    echo 'PDOException: ', $e->getMessage();
}