diff --git a/phpBB/phpbb/mention/source/base_group.php b/phpBB/phpbb/mention/source/base_group.php
index a31071a964..e6281bcbac 100644
--- a/phpBB/phpbb/mention/source/base_group.php
+++ b/phpBB/phpbb/mention/source/base_group.php
@@ -149,7 +149,7 @@ abstract class base_group implements source_interface
 					'type'	=> 'group',
 					'img'	=> phpbb_get_group_avatar($groups[$group_id]),
 				],
-				'rank'		=> $group_rank['title'],
+				'rank'		=> (isset($group_rank['title'])) ? $group_rank['title'] : '',
 				'priority'	=> $this->get_priority($groups[$group_id]),
 			]);
 		}
diff --git a/phpBB/phpbb/mention/source/base_user.php b/phpBB/phpbb/mention/source/base_user.php
index a9c0fdaf82..2fd6cf5f98 100644
--- a/phpBB/phpbb/mention/source/base_user.php
+++ b/phpBB/phpbb/mention/source/base_user.php
@@ -120,7 +120,5 @@ abstract class base_user implements source_interface
 				'priority'	=> $this->get_priority($user),
 			]);
 		}
-
-		$this->db->sql_freeresult($result);
 	}
 }