Custom book block is not using parent default configuration

Unable to reproduce. Can you please provide more information?

• Which browser are you using? Does the error prevail in other browsers?
• Does the error show, when placing other blocks?
• What is the complete error AJAX error message?
• Does any related error show in the reports (/admin/reports/dblog)?
• Are there other modules that could cause this behavior?

@simonbaese,

In answer to your questions:

Which browser are you using? Does the error prevail in other browsers?
I was using Chrome, but error persists in Edge. I'm assuming it happens in Safari and Firefox as well but I haven't tested them.

Does the error show, when placing other blocks?
No, it doesn't.

What is the complete error AJAX error message?
It's huge, but here's the first part which looks like maybe what you might need:

"\nAn AJAX HTTP error occurred.\nHTTP Result Code: 200\nDebugging information follows.\nPath: /admin/structure/block/add/custom_book_navigation/hhsds?region=sidebar_first\nStatusText: parsererror\nResponseText: Warning: Undefined array key \"use_top_level_title\" in /app/docroot/core/modules/book/src/Plugin/Block/BookNavigationBlock.php on line 113\n[{\"command\":\"settings\",\"settings\":{\"ajaxPageState\":{\"theme\":\"claro\",\"theme_token\":\"yPltGbVFEAkLR7nAUBnafWSDBzlW5YEvTHh0vt3Qte4\",\"libraries\"

Does any related error show in the reports (/admin/reports/dblog)?
No, there isn't anything there.

Are there other modules that could cause this behavior?
I do have Menu Block enabled. I tried uninstalling it and just using Custom Book Block and core menu blocks, but error still happens when I try to add a custom book navigation block.

It seems like you are using a patch from this issue ✨ Allow book navigation title to be overridden by top-level node title Postponed . The Custom Book Block did not play well with the changed parent configuration. Please use the changes from the merge request or the attached patch file and test again.

The posted patch may conflict with the changes from another open issue ✨ Start level and active branch of tree Needs review !

Merging this since I would like to publish a new release soon. Please continue the discussion here if there are further issues.

Automatically closed - issue fixed for 2 weeks with no activity.