diff --git a/core/modules/picture/lib/Drupal/picture/Plugin/field/formatter/PictureFormatter.php b/core/modules/picture/lib/Drupal/picture/Plugin/field/formatter/PictureFormatter.php
index 1e536b3..debebb4 100644
--- a/core/modules/picture/lib/Drupal/picture/Plugin/field/formatter/PictureFormatter.php
+++ b/core/modules/picture/lib/Drupal/picture/Plugin/field/formatter/PictureFormatter.php
@@ -172,7 +172,7 @@ public function viewElements(FieldItemListInterface $items) {
         '#width' => $item['width'],
         '#height' => $item['height'],
         '#breakpoints' => $breakpoint_styles,
-        '#alt' => isset($item['alt']) ? $item['alt'] : NULL,
+        '#alt' => isset($item['alt']) || array_key_exists('alt', $item) ? $item['alt'] : NULL,
         '#title' => isset($item['title']) ? $item['title'] : NULL,
         '#attributes' => isset($item['attributes']) ? $item['attributes'] : NULL,
         '#attached' => array('library' => array(
diff --git a/core/modules/picture/picture.module b/core/modules/picture/picture.module
index 7278449..d36f256 100644
--- a/core/modules/picture/picture.module
+++ b/core/modules/picture/picture.module
@@ -173,11 +173,12 @@ function template_preprocess_picture(&$variables) {
 
   // Prepare picture tag attributes.
   $attributes = array();
-  foreach (array('alt', 'title') as $key) {
-    if (isset($variables[$key])) {
-      $attributes[$key] = $variables[$key];
-    }
-  }
+	if (isset($variables['alt']) || array_key_exists('alt', $variables) {
+		$attributes['alt'] = $variables['alt'];
+	}
+	if (isset($variables['title'])) {
+		$attributes['title'] = $variables['title'];
+	}
   $variables['attributes'] = new Attribute($attributes);
 
   if (!empty($variables['breakpoints'])) {
@@ -240,7 +241,7 @@ function template_preprocess_picture(&$variables) {
       '#width' => $variables['width'],
       '#height' => $variables['height'],
       '#style_name' => $variables['style_name'],
-      '#alt' => isset($variables['alt']) ? $variables['alt'] : NULL,
+      '#alt' => isset($variables['alt']) || array_key_exists('alt', $variables) ? $variables['alt'] : NULL,
       '#title' => isset($variables['title']) ? $variables['title'] : NULL,
     );
   }
@@ -251,7 +252,7 @@ function template_preprocess_picture(&$variables) {
       '#uri' => $variables['uri'],
       '#width' => $variables['width'],
       '#height' => $variables['height'],
-      '#alt' => isset($variables['alt']) ? $variables['alt'] : NULL,
+      '#alt' => isset($variables['alt']) || array_key_exists('alt', $variables) ? $variables['alt'] : NULL,
       '#title' => isset($variables['title']) ? $variables['title'] : NULL,
     );
   }