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Drupal 9 – update to PHP 8 module no longer works

I have updated my Drupal from 8 to 9 and used PHP 7.4. Now I have chosen the time to update to PHP 8. Everything runs so far, only with a self-built module I get now an Error message:

The website encountered an unexpected error. Please try again later. Error: Attempt to assign property "format" on null in copy_fields_from_model_contract_node_edit_node_prepare_form() (line 57 of modules/custom/copy_fields_from_model_contract_node_edit/copy_fields_from_model_contract_node_edit.module).

This concerns exactly this line:

$node->body->format = 'full_html';

The code of my module is not elegant, but it did its job as desired. Basically, I copy from another node the content of the body field into a body field of another node. The code of the whole module looks like this:

<?php  use DrupalnodeNodeInterface; use DrupalCoreFormFormStateInterface;   /** * Implements hook_ENTITY_TYPE_prepare_form() for node entities. */ function copy_fields_from_model_contract_node_edit_node_prepare_form(NodeInterface $node, $operation, FormStateInterface $form_state) {  //TODO Build NID as array and go through with loop    $arr_vertraege = array(6766, 6769, 6768, 6775, 6767, 6776, 6777, 6778, 6779, 6780, 6781, 6782);    foreach ($arr_vertraege as $mustervertraege) {      $nid = $mustervertraege;     $node_storage = Drupal::entityTypeManager()->getStorage('node');     $node = $node_storage->load($nid);      if ($nid == $mustervertraege) {         $getcontract = $node->field_vertragsinhalt->value;     }    //TODO Works without ($operation == 'default')    if ($operation == 'edit') {     /*dpm("Modul an edit");*/     //TODO Shall always pull the current node and nid. But does not work yet with node creation. Error: Call to a member function id() on null in      $node = Drupal::routeMatch()->getParameter('node');     $nid = $node->id();     $node_storage = Drupal::entityTypeManager()->getStorage('node');     $node = $node_storage->load($nid);      if ($node->getType() == 'buch_anlegen') {       if ($node->field_vertrag_updaten->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[0]) {           $node->field_vertragsinhalt->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_2->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[1]) {           $node->field_vertragsinhalt_2->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_3->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[2]) {           $node->field_vertragsinhalt_3->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_4->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[3]) {           $node->field_vertragsinhalt_4->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_5->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[4]) {           $node->field_vertragsinhalt_5->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_6->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[5]) {           $node->field_vertragsinhalt_6->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_7->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[6]) {           $node->field_vertragsinhalt_7->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_8->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[7]) {           $node->field_vertragsinhalt_8->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_9->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[8]) {           $node->field_vertragsinhalt_9->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_10->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[9]) {           $node->field_vertragsinhalt_10->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_11->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[10]) {           $node->field_vertragsinhalt_11->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }       if ($node->field_vertrag_updaten_12->value == '1') {         //  dpm($node->field_vertrag_updaten->value);         //var_dump($node);          if ($mustervertraege == $arr_vertraege[11]) {           $node->field_vertragsinhalt_12->value = $getcontract;           $node->body->format = 'full_html';           // don't save the node yet, it will be saved after submitting         }       }     }   }   } }

Does anyone have a tip for me? I would be very grateful.

Greetz Bavra

P.S.: Complete error message from the logs:

Message    Error: Attempt to assign property "format" on null in copy_fields_from_model_contract_node_edit_node_prepare_form() (line 57 of /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/modules/custom/copy_fields_from_model_contract_node_edit/copy_fields_from_model_contract_node_edit.module) #0 [internal function]: copy_fields_from_model_contract_node_edit_node_prepare_form(Object(DrupalnodeEntityNode), 'edit', Object(DrupalCoreFormFormState)) #1 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Entity/EntityForm.php(397): call_user_func_array('copy_fields_fro...', Array) #2 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Entity/EntityForm.php(129): DrupalCoreEntityEntityForm->prepareInvokeAll('node_prepare_fo...', Object(DrupalCoreFormFormState)) #3 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Entity/ContentEntityForm.php(287): DrupalCoreEntityEntityForm->init(Object(DrupalCoreFormFormState)) #4 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Entity/EntityForm.php(96): DrupalCoreEntityContentEntityForm->init(Object(DrupalCoreFormFormState)) #5 [internal function]: DrupalCoreEntityEntityForm->buildForm(Array, Object(DrupalCoreFormFormState)) #6 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Form/FormBuilder.php(531): call_user_func_array(Array, Array) #7 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Form/FormBuilder.php(278): DrupalCoreFormFormBuilder->retrieveForm('node_buch_anleg...', Object(DrupalCoreFormFormState)) #8 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Controller/FormController.php(73): DrupalCoreFormFormBuilder->buildForm(Object(DrupalnodeNodeForm), Object(DrupalCoreFormFormState)) #9 [internal function]: DrupalCoreControllerFormController->getContentResult(Object(SymfonyComponentHttpFoundationRequest), Object(DrupalCoreRoutingRouteMatch)) #10 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #11 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/Render/Renderer.php(564): DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->DrupalCoreEventSubscriber{closure}() #12 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): DrupalCoreRenderRenderer->executeInRenderContext(Object(DrupalCoreRenderRenderContext), Object(Closure)) #13 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #14 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/vendor/symfony/http-kernel/HttpKernel.php(158): DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber->DrupalCoreEventSubscriber{closure}() #15 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/vendor/symfony/http-kernel/HttpKernel.php(80): SymfonyComponentHttpKernelHttpKernel->handleRaw(Object(SymfonyComponentHttpFoundationRequest), 1) #16 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/modules/contrib/redirect_after_login/src/RedirectMiddleware.php(46): SymfonyComponentHttpKernelHttpKernel->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #17 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Drupalredirect_after_loginRedirectMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #18 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): DrupalCoreStackMiddlewareSession->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #19 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): DrupalCoreStackMiddlewareKernelPreHandle->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #20 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupalpage_cacheStackMiddlewarePageCache->pass(Object(SymfonyComponentHttpFoundationRequest), 1, true) #21 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/modules/ban/src/BanMiddleware.php(50): Drupalpage_cacheStackMiddlewarePageCache->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #22 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): DrupalbanBanMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #23 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): DrupalCoreStackMiddlewareReverseProxyMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #24 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): DrupalCoreStackMiddlewareNegotiationMiddleware->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #25 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/core/lib/Drupal/Core/DrupalKernel.php(708): StackStackedHttpKernel->handle(Object(SymfonyComponentHttpFoundationRequest), 1, true) #26 /home/bavramor/data/Webdesign/Webseiten/landwehrcie-backup-drupal9/web/index.php(19): DrupalCoreDrupalKernel->handle(Object(SymfonyComponentHttpFoundationRequest)) #27 {main}
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