I receive an error when I change pages if I am impersonated as another user in Symfony2. It only happens when the route has additional parameters. There is no sign of route generation at the pointed line number.

Controller action

/**
 * @Route("/member/{id}", name="member_page")
 * @Template()
 */
public function memberAction($id)

Error

An exception has been thrown during the rendering of a template ("Some mandatory parameters are missing ("slug") to generate a URL for route "member_page".") in members.html.twig at line 2.