diff --git a/phpBB/phpbb/notification/type/admin_activate_user.php b/phpBB/phpbb/notification/type/admin_activate_user.php
index 9f2ae857ef..78c10ac36a 100644
--- a/phpBB/phpbb/notification/type/admin_activate_user.php
+++ b/phpBB/phpbb/notification/type/admin_activate_user.php
@@ -175,7 +175,7 @@ class admin_activate_user extends \phpbb\notification\type\base
 	/**
 	* {@inheritdoc}
 	*/
-	public function create_insert_array($user, $pre_create_data)
+	public function create_insert_array($user, $pre_create_data = array())
 	{
 		$this->set_data('user_actkey', $user['user_actkey']);
 		$this->notification_time = $user['user_regdate'];