Issue #3043687 by phenaproxima, tim.plunkett, johndevman: Layout Builder's Quick Edit integration causes fatals when using field blocks for entities other than the one being viewed

core/modules/layout_builder/src/QuickEditIntegration.php

@@ -312,7 +312,7 @@ class QuickEditIntegration implements ContainerInjectionInterface {
    * @see \Drupal\layout_builder\Plugin\Block\FieldBlock
    */
   private function supportQuickEditOnComponent(array $component, FieldableEntityInterface $entity) {
-    if (isset($component['content']['#field_name'], $component['#base_plugin_id']) && $component['#base_plugin_id'] === 'field_block') {
+    if (isset($component['content']['#field_name'], $component['#base_plugin_id']) && $component['#base_plugin_id'] === 'field_block' && $entity->hasField($component['content']['#field_name'])) {
       return $entity->getFieldDefinition($component['content']['#field_name'])->isDisplayConfigurable('view');
     }
     return FALSE;

core/modules/layout_builder/tests/src/Functional/LayoutBuilderQuickEditTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Drupal\Tests\layout_builder\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests Layout Builder integration with Quick Edit.
+ *
+ * @group layout_builder
+ */
+class LayoutBuilderQuickEditTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'layout_builder',
+    'node',
+    'quickedit',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create two nodes.
+    $this->createContentType([
+      'type' => 'bundle_with_section_field',
+      'name' => 'Bundle with section field',
+    ]);
+    $this->createNode([
+      'type' => 'bundle_with_section_field',
+    ]);
+  }
+
+  /**
+   * Tests Quick Edit integration with a block from a different entity type.
+   */
+  public function testPlaceFieldBlockFromDifferentEntityType() {
+    $page = $this->getSession()->getPage();
+
+    $this->drupalLogin($this->drupalCreateUser([
+      'configure any layout',
+      'administer node display',
+      'access in-place editing',
+    ]));
+
+    // From the manage display page, go to manage the layout.
+    $this->drupalGet('admin/structure/types/manage/bundle_with_section_field/display/default');
+    $this->drupalPostForm(NULL, ['layout[enabled]' => TRUE], 'Save');
+    $this->drupalPostForm(NULL, ['layout[allow_custom]' => TRUE], 'Save');
+
+    // Place a field block for a user entity field.
+    $this->drupalGet('node/1/layout');
+    $page->clickLink('Add Block');
+    $page->clickLink('Name');
+    $page->pressButton('Add Block');
+    $page->pressButton('Save layout');
+
+    $this->drupalGet('node/1');
+    $this->assertSession()->statusCodeEquals(200);
+  }
+
+}