Steps to Reproduce:
create an article. add a translation. edit the translation.
this error is produced:
Fatal error: Call to a member function bundle() on a non-object in /var/www/drupal8/core/modules/node/node.module on line 136
Here is the code:
case 'node/%/edit':
$node = node_load($arg[1]);
$type = node_type_load($node->bundle());In this case, the url would be
/<langcode>/node/<nid>/edit, so the $arg[1] would return "node".