diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 05960a0..4a9c46a 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -1231,7 +1231,7 @@ function template_preprocess_forum_topic_list(&$variables) {
       $variables['topics'][$id]->new_text = '';
       $variables['topics'][$id]->new_url = '';
       if ($topic->new_replies) {
-        $variables['topics'][$id]->new_text = format_plural($topic->new_replies, '1 new post<span class="element-invisible"> in topic %title</span>', '@count new posts<span class="element-invisible"> in topic %title</span>', array('%title' => $original_title));
+        $variables['topics'][$id]->new_text = format_plural($topic->new_replies, '1 new post<span class="element-invisible"> in topic %title</span>', '@count new posts<span class="element-invisible"> in topic %title</span>', array('%title' => $variables['topics'][$id]->title));
         $variables['topics'][$id]->new_url = url("node/$topic->nid", array('query' => comment_new_page_count($topic->comment_count, $topic->new_replies, $topic), 'fragment' => 'new'));
       }
 
diff --git a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
index f56cfbb..997117a 100644
--- a/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
+++ b/core/modules/forum/lib/Drupal/forum/Tests/ForumTest.php
@@ -82,6 +82,7 @@ function setUp() {
       'administer menu',
       'administer taxonomy',
       'create forum content',
+      'access comments',
     ));
     $this->edit_any_topics_user = $this->drupalCreateUser(array(
       'access administration pages',
@@ -95,6 +96,13 @@ function setUp() {
       'delete own forum content',
     ));
     $this->web_user = $this->drupalCreateUser();
+    $this->post_comment_user = $this->drupalCreateUser(array(
+      'administer content types',
+      'create forum content',
+      'post comments',
+      'skip comment approval',
+      'access comments',
+    ));
   }
 
   /**
@@ -443,6 +451,35 @@ private function doBasicTests($user, $admin) {
   }
 
   /**
+   * Tests for notices on a rendered page.
+   */
+  function testUndefinedVars() {
+    // Login as the first user.
+    $this->drupalLogin($this->admin_user);
+    // Create a forum container.
+    $this->container = $this->createForum('container');
+    // Create a forum.
+    $this->forum = $this->createForum('forum');
+    // Create a topic.
+    $node = $this->createForumTopic($this->forum, FALSE);
+
+    // Login as a second user.
+    $this->drupalLogin($this->post_comment_user);
+    // Post a reply to the topic.
+    $edit = array();
+    $edit['subject'] = $this->randomName();
+    $edit['comment_body[' . LANGUAGE_NOT_SPECIFIED . '][0][value]'] = $this->randomName();
+    $this->drupalPost("node/$node->nid", $edit, t('Save'));
+    $this->assertResponse(200);
+
+    // Login as the first user.
+    $this->drupalLogin($this->admin_user);
+    // Check that forum renders properly.
+    $this->drupalGet("forum/{$this->forum['tid']}");
+    $this->assertResponse(200);
+  }
+
+  /**
    * Creates a forum topic.
    *
    * @param array $forum