Zend Framework 2 - Listeners & Fatal error: Maximum function nesting level of '100' reached, aborting!

CategoryListener.php

<?php
namespace ProductCategory\Listeners;

use Zend\EventManager\EventManagerInterface;
use Zend\EventManager\ListenerAggregateInterface;

class CategoryListener implements ListenerAggregateInterface
{
    protected $serviceManager;
    
    public function __construct(\Zend\ServiceManager\ServiceLocatorInterface $serviceManager){
        
        $this->serviceManager = $serviceManager;
    }
    
    /**
     * @var \Zend\Stdlib\CallbackHandler[]
     */
    protected $listeners = array();

    /**
     * {@inheritDoc}
     */
    public function attach(EventManagerInterface $events)
    {
        $sharedEvents      = $events->getSharedManager();
        $this->listeners[] = $sharedEvents->attach(\Zend\Mvc\MvcEvent::EVENT_FINISH, array($this, 'onFinish'), 9);
    }

    public function detach(EventManagerInterface $events)
    {
        foreach ($this->listeners as $index => $listener) {
            if ($events->detach($listener)) {
                unset($this->listeners[$index]);
            }
        }
    }

    public function onFinish($e)
    {
         $data = $e->getParam('data');
        
        // Log the data
         $this->serviceManager->get('Zend\Log\Logger')->crit($data);
    }
}

Module.php

<?php

namespace Product;

use Product\Entity\ProductAttributesElementsEntity;

use ProductCategory\Listeners\CategoryListener;
use Zend\Mvc\ModuleRouteListener;
use Zend\Mvc\MvcEvent;
use Zend\Db\TableGateway\TableGateway;
use Zend\Db\ResultSet\ResultSet;
use Zend\ModuleManager\Feature\DependencyIndicatorInterface;

class Module implements DependencyIndicatorInterface{
	
    public function onBootstrap(MvcEvent $e)
    {
        $eventManager        = $e->getApplication()->getEventManager();
        $moduleRouteListener = new ModuleRouteListener();
        $moduleRouteListener->attach($eventManager);
        
        $sm = $e->getApplication()->getServiceManager();
//         $eventManager->attach(new ProductListener($sm));
        $eventManager->attach(new CategoryListener($sm));
    }
    
    /**
     * Check the dependency of the module
     * (non-PHPdoc)
     * @see Zend\ModuleManager\Feature.DependencyIndicatorInterface::getModuleDependencies()
     */
    public function getModuleDependencies()
    {
    	return array();
    }

    public function getConfig()
    {
        return include __DIR__ . '/config/module.config.php';
    }
    
    public function getAutoloaderConfig()
    {
      
        return array(
            'Zend\Loader\StandardAutoloader' => array(
                'namespaces' => array(
                    __NAMESPACE__ => __DIR__ . '/src/' . __NAMESPACE__,
                    __NAMESPACE__ . "Admin" => __DIR__ . '/src/' . __NAMESPACE__ . "Admin",
                    __NAMESPACE__ . "Settings" => __DIR__ . '/src/' . __NAMESPACE__ . "Settings",
                    __NAMESPACE__ . "Category" => __DIR__ . '/src/' . __NAMESPACE__ . "Category",
                ),
            ),
        );
    }
}