After upgrading to 2.4 I started getting this error. null isn't scalar but shouldn't it be allowed?

Is this expected? If it is a bug, I can fix.

References:

• symfony/src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php

  Line 80 in e838bf0

  private function checkNonScalar($values)

• [HttpKernel] changed the fragment handler to explicitely disallow non-scalar in generated URIs (refs #8263) #8437