I am migrating a website from Drupal 7 to Backdrop and I got almost everything to work.
Most of the content is displayed properly, the only thing that is not working are Book pages. I can edit them, but in view mode I get this error: "Call to a member function bundle() on null"
This is what I see in the logs:
"Error: Call to a member function bundle() on null in node_access() (line 2715 of /home/doriemae/migrate.head-massage.net/core/modules/node/node.module)."
Any help would be greatly appreciated.