TYPO3.Flow

For example
I have a aspect:

         /**
     * Register every exception 
     *
     * @FLOW3\AfterThrowing("class(F2\MyPackage\.*)")
     * @param \TYPO3\FLOW3\AOP\JoinPointInterface $joinPoint
     * @return void
     */
    public function logException(\TYPO3\FLOW3\AOP\JoinPointInterface $joinPoint) {
        if ($joinPoint->hasException()) {
            $exception = $joinPoint->getException();
            $this->logger->log('Excepcion: ' . $joinPoint->getClassName() . ' ' . $exception->getMessage());
        }
    }

Now I tried to write a RoutePartHandler, the removeMatchingPortionFromRequestPath() uses one argument by reference.

class FileRoutePartHandler extends  \TYPO3\FLOW3\MVC\Web\Routing\DynamicRoutePart{
    protected function findValueToMatch($routePath)
    {
        $matches = array();
        preg_match('/^[0-9]{4}\/[0-9]{2}\/[0-9]{2}\/[a-z0-9\-]+/', $routePath, $matches);
        $result = (count($matches) === 1) ? current($matches) : '';
        return $result;
    }

}

Then FLOW3 fires an exception (see attachment)

If I disable the Aspect then It works