Incompatible when core Book is installed

Warning: Trying to access array offset on value of type null in Drupal\book\BookManager->addFormElements() (line 252 of /home/cannesfestival/public_html/core/modules/book/src/BookManager.php) #0 /home/cannesfestival/public_html/core/includes/bootstrap.inc(347): _drupal_error_handler_real(2, 'Trying to acces...', '/home/cannesfes...', 252) #1 /home/cannesfestival/public_html/core/modules/book/src/BookManager.php(252): _drupal_error_handler(2, 'Trying to acces...', '/home/cannesfes...', 252) #2 /home/cannesfestival/public_html/core/modules/book/book.module(150): Drupal\book\BookManager->addFormElements(Array, Object(Drupal\Core\Form\FormState), Object(Drupal\node\Entity\Node), Object(Drupal\Core\Session\AccountProxy), true) #3 /home/cannesfestival/public_html/core/lib/Drupal/Core/Extension/ModuleHandler.php(562): book_form_node_form_alter(Array, Object(Drupal\Core\Form\FormState), 'node_film_edit_...') #4 /home/cannesfestival/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(840): Drupal\Core\Extension\ModuleHandler->alter('form', Array, Object(Drupal\Core\Form\FormState), 'node_film_edit_...') #5 /home/cannesfestival/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(434): Drupal\Core\Form\FormBuilder->prepareForm('node_film_edit_...', Array, Object(Drupal\Core\Form\FormState)) #6 /home/cannesfestival/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(633): Drupal\Core\Form\FormBuilder->rebuildForm('node_film_edit_...', Object(Drupal\Core\Form\FormState), Array) #7 /home/cannesfestival/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(325): Drupal\Core\Form\FormBuilder->processForm('node_film_edit_...', Array, Object(Drupal\Core\Form\FormState)) #8 /home/cannesfestival/public_html/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\node\NodeForm), Object(Drupal\Core\Form\FormState)) #9 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #10 /home/cannesfestival/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #11 /home/cannesfestival/public_html/core/lib/Drupal/Core/Render/Renderer.php(580): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #12 /home/cannesfestival/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #13 /home/cannesfestival/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #14 /home/cannesfestival/public_html/vendor/symfony/http-kernel/HttpKernel.php(169): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #15 /home/cannesfestival/public_html/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #16 /home/cannesfestival/public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #17 /home/cannesfestival/public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 /home/cannesfestival/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 /home/cannesfestival/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 /home/cannesfestival/public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /home/cannesfestival/public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /home/cannesfestival/public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /home/cannesfestival/public_html/core/lib/Drupal/Core/DrupalKernel.php(718): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /home/cannesfestival/public_html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #25 {main}

Comments & Activities

Issue created by @liliplanet
Status changed to Postponed: needs info over 1 year ago2:02pm 5 June 2023
Comment over 1 year ago →
🇺🇸United States robphillips
Could you please provide some additional context? It looks like you're using the book module. It would helpful if you could share the form display config and any other details such as customizations, theme, etc.
Comment over 1 year ago →
🇫🇷France liliplanet Cannes
Hi Rob, thank you for your response. Field group works perfectly when I select any other option: details, fieldset, tab, etc.

Steps to reproduce:

1. formstep is selected in manage form display
2. edit a node
3. when you select 'next', you get the above error.

Yes, the core book module is installed, but not on the content type where formstep is enabled.

There are no customizations.

Theme: Bootstrap 5

-- I recommend you switch on the core book module in your installation to see the error.
Comment over 1 year ago →
🇺🇸United States robphillips
Does the error go away if the Book module is uninstalled?
Comment over 1 year ago →
🇫🇷France liliplanet Cannes
Sorry I can't uninstall book module, it is a production site. Have you perhaps tried on your dev installation?
Status changed to Closed: cannot reproduce over 1 year ago6:33am 24 June 2023
Comment over 1 year ago →
🇺🇸United States robphillips
Sorry, I wasn't able to replicate. However, a number of important issues have been resolved in the latest release. I'd like to invite you to give it another try and report back if the problem still occurs. Thanks!

https://www.drupal.org/project/entity_form_steps/releases/1.1.0 →