diff --git a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
index d95b3fb..abb8e23 100644
--- a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
+++ b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
@@ -61,6 +61,7 @@ public function testAttachments() {
     $this->assertHeader('X-Drupal-Cache', 'HIT');
 
     // Now repeat all of the preceeding using drupal_process_attached().
+    debug('Now using drupal_process_attached().');
     // Test ['#attached']['http_header] = ['Status', $code].
     $this->drupalGet('/render_attached_test/teapot_dpa');
     $this->assertResponse(418);
@@ -144,8 +145,13 @@ protected function assertFeed() {
       'title' => 'Your RSS feed.',
     ];
     $test_meta = reset($test_meta);
-    foreach ($test_meta->attributes() as $attribute => $value) {
-      $this->assertEqual($value, $test_meta_attributes[$attribute]);
+    if (empty($test_meta)) {
+      $this->fail('Unable to find feed link.');
+    }
+    else {
+      foreach ($test_meta->attributes() as $attribute => $value) {
+        $this->assertEqual($value, $test_meta_attributes[$attribute]);
+      }
     }
   }
 
@@ -158,8 +164,13 @@ protected function assertHead() {
     $this->assertEqual(1, count($test_meta), 'There\'s only one test attribute.');
     // Grab the only DOM element.
     $test_meta = reset($test_meta);
-    $test_meta_attributes = $test_meta->attributes();
-    $this->assertEqual($test_meta_attributes['test-attribute'], 'testy');
+    if (empty($test_meta)) {
+      $this->fail('Unable to find the head meta.');
+    }
+    else {
+      $test_meta_attributes = $test_meta->attributes();
+      $this->assertEqual($test_meta_attributes['test-attribute'], 'testy');
+    }
   }
 
 }