in combination with book module gives an error
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3575654. -->
Reported by: [grienauer](https://www.drupal.org/user/80801)
Related to !156
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>when the <a href="https://www.drupal.org/project/book">https://www.drupal.org/project/book</a> is installed and in use, Frontend Editing results in an Error on the Sidebar, when trying to edit it.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>Installing <a href="https://www.drupal.org/project/book">https://www.drupal.org/project/book</a><br>
configure it on a node.<br>
Add Frontend Editing<br>
Try to edit the node</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Dig into the Problem ;P</p>
<p><code>TypeError: Drupal\book\BookManager::addParentSelectFormElements(): Argument #1 ($book_link) must be of type array, null given, called in /var/www/html/web/modules/contrib/book/src/BookManager.php on line 242 in Drupal\book\BookManager->addParentSelectFormElements() (line 398 of modules/contrib/book/src/BookManager.php).</code></p>
<p>Maybe also wrong issue queue and I should move it over to the book issue queue.<br>
Please inform me if I should open it there.</p>
<p>Thank You!</p>
issue