Call to a member function getTitle() on null in gin_preprocess_page_title()

Problem/Motivation

On gin_preprocess_page_title() $node is not always instanceof Node and it breakes the administration page.

Steps to reproduce

Create a administration view with a url that contains a "%node" route parameter and a Content:ID as contextual filter.

I think this problem is introduced here https://git.drupalcode.org/project/gin/-/commit/a46976df65d5610f8c91259a... (not sure if there is a drupal issue for this commit). I’ve created a patch that solves the problem by checking the route name.