Missing variable

src/Worker/DBUpdate.php

@@ -9,6 +9,8 @@ use Friendica\Core\Config;
 
 class DBUpdate {
 	public static function execute() {
+		$a = get_app();
+
 		// We are deleting the latest dbupdate entry.
 		// This is done to avoid endless loops because the update was interupted.
 		Config::delete('database', 'dbupdate_'.DB_UPDATE_VERSION);