Issue #3180227 by danflanagan8, robertom, xjm, Lendude, quietone: Notice: Trying to access array offset on value of type null in Drupal\views\Plugin\views\display\EntityReference->query()

core/modules/views/src/Plugin/views/display/EntityReference.php

@@ -160,7 +160,18 @@ class EntityReference extends DisplayPluginBase {
     $id_table = $this->view->storage->get('base_table');
     $this->id_field_alias = $this->view->query->addField($id_table, $id_field);
 
-    $options = $this->getOption('entity_reference_options');
+    $options = $this->getOption('entity_reference_options') ?? [];
+    // The entity_reference_options are typically set during a call to
+    // Drupal\views\Plugin\EntityReferenceSelection\ViewsSelection::initializeView().
+    // If any entity_reference_options are not yet set, we apply the same
+    // default values that would typically be added by that method.
+    $default_options = [
+      'match' => NULL,
+      'match_operator' => 'CONTAINS',
+      'limit' => 0,
+      'ids' => NULL,
+    ];
+    $options += $default_options;
 
     // Restrict the autocomplete options based on what's been typed already.
     if (isset($options['match'])) {

core/modules/views/tests/src/Functional/Plugin/DisplayEntityReferenceTest.php

@@ -275,6 +275,23 @@ class DisplayEntityReferenceTest extends ViewTestBase {
     $view->setDisplay('entity_reference_1');
     $render = $view->display_handler->render();
     $this->assertSame([], $render, 'Render returned empty array');
+
+    // Execute the View without setting the 'entity_reference_options'.
+    // This is equivalent to using the following as entity_reference_options.
+    // @code
+    // $options = [
+    //   'match' => NULL,
+    //   'match_operator' => 'CONTAINS',
+    //   'limit' => 0,
+    //   'ids' => NULL,
+    // ];
+    // @endcode
+    // Assert that this view returns a row for each test entity.
+    $view->destroy();
+    $view = Views::getView('test_display_entity_reference');
+    $view->setDisplay('entity_reference_1');
+    $this->executeView($view);
+    $this->assertCount(13, $view->result, 'Search returned thirteen rows');
   }
 
 }