Add required use statement in mod/subthread

diff --git a/mod/subthread.php b/mod/subthread.php
index 29d3f5e06eedda6f0cc34f863d78b743233ff171..0399ac0cefe9ef63b18358c915d9be829d335159 100644 (file)
--- a/mod/subthread.php
+++ b/mod/subthread.php
@@ -6,6 +6,7 @@ use Friendica\App;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
+use Friendica\Core\Session;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Model\Item;