Issue #3167901 by raman.b, johnwebdev, Spokje: RemoveSectionForm assumes there is a label

core/modules/layout_builder/src/Form/RemoveSectionForm.php

@@ -25,7 +25,9 @@ public function getFormId() {
    */
   public function getQuestion() {
     $configuration = $this->sectionStorage->getSection($this->delta)->getLayoutSettings();
-    if ($configuration['label']) {
+    // Layouts may choose to use a class that might not have a label
+    // configuration.
+    if (!empty($configuration['label'])) {
       return $this->t('Are you sure you want to remove @section?', ['@section' => $configuration['label']]);
     }
     return $this->t('Are you sure you want to remove section @section?', ['@section' => $this->delta + 1]);

core/modules/layout_builder/tests/modules/layout_builder_test/src/Plugin/Layout/LayoutWithoutLabel.php

+<?php
+
+namespace Drupal\layout_builder_test\Plugin\Layout;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Layout\LayoutDefault;
+
+/**
+ * Layout plugin without a label configuration.
+ *
+ * @Layout(
+ *   id = "layout_without_label",
+ *   label = @Translation("Layout Without Label"),
+ *   regions = {
+ *     "main" = {
+ *       "label" = @Translation("Main Region")
+ *     }
+ *   },
+ * )
+ */
+class LayoutWithoutLabel extends LayoutDefault {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {}
+
+}

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

@@ -1320,6 +1320,40 @@ public function testRemovingAllSections() {
     $assert_session->pageTextNotContains('The first node body');
   }
 
+  /**
+   * Tests removing section without layout label configuration.
+   */
+  public function testRemovingSectionWithoutLayoutLabel() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    $this->drupalLogin($this->drupalCreateUser([
+      'configure any layout',
+      'administer node display',
+    ]));
+
+    // Enable overrides.
+    $field_ui_prefix = 'admin/structure/types/manage/bundle_with_section_field';
+    $this->drupalGet("$field_ui_prefix/display/default");
+    $this->submitForm(['layout[enabled]' => TRUE], 'Save');
+    $this->submitForm(['layout[allow_custom]' => TRUE], 'Save');
+
+    $this->drupalGet("$field_ui_prefix/display/default/layout");
+    $page->clickLink('Add section');
+
+    $assert_session->linkExists('Layout Without Label');
+    $page->clickLink('Layout Without Label');
+    $page->pressButton('Add section');
+    $assert_session->elementsCount('css', '.layout', 2);
+
+    $assert_session->linkExists('Remove Section 1');
+    $this->clickLink('Remove Section 1');
+    $page->pressButton('Remove');
+
+    $assert_session->statusCodeEquals(200);
+    $assert_session->elementsCount('css', '.layout', 1);
+  }
+
   /**
    * Asserts that the correct layouts are available.
    */