Issue #2424697 by jedihe, yched: ResponsiveImageFormatter throws an exception on node preview

core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php

@@ -16,7 +16,6 @@
 use Drupal\Core\Url;
 use Drupal\image\Plugin\Field\FieldFormatter\ImageFormatterBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
-use Drupal\responsive_image\Entity\ResponsiveImageStyle;
 use Drupal\image\Entity\ImageStyle;
 
 /**
@@ -179,7 +178,10 @@ public function viewElements(FieldItemListInterface $items) {
     $url = NULL;
     // Check if the formatter involves a link.
     if ($this->getSetting('image_link') == 'content') {
-      $url = $items->getEntity()->urlInfo();
+      $entity = $items->getEntity();
+      if (!$entity->isNew()) {
+        $url = $entity->urlInfo();
+      }
     }
     elseif ($this->getSetting('image_link') == 'file') {
       $link_file = TRUE;

core/modules/responsive_image/src/Tests/ResponsiveImageFieldDisplayTest.php

@@ -368,6 +368,25 @@ private function assertResponsiveImageFieldFormattersLink($link_type) {
     $this->createImageField($field_name, 'article', array('uri_scheme' => 'public'));
     // Create a new node with an image attached.
     $test_image = current($this->drupalGetTestFiles('image'));
+
+    // Test the image linked to file formatter.
+    $display_options = array(
+      'type' => 'responsive_image',
+      'settings' => array(
+        'image_link' => $link_type,
+        'responsive_image_style' => 'style_one',
+        'fallback_image_style' => 'large',
+      ),
+    );
+    entity_get_display('node', 'article', 'default')
+      ->setComponent($field_name, $display_options)
+      ->save();
+    // Ensure that preview works.
+    $this->previewNodeImage($test_image, $field_name, 'article');
+
+    // Look for a picture tag in the preview output
+    $this->assertPattern('/picture/');
+
     $nid = $this->uploadNodeImage($test_image, $field_name, 'article');
     $this->container->get('entity.manager')->getStorage('node')->resetCache(array($nid));
     $node = Node::load($nid);