Fix Room object creation with null from oracle

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Manager.php

@@ -151,9 +151,9 @@ class Manager {
 			(int) $row['type'],
 			(int) $row['read_only'],
 			(int) $row['lobby_state'],
-			$row['token'],
-			$row['name'],
-			$row['password'],
+			(string) $row['token'],
+			(string) $row['name'],
+			(string) $row['password'],
 			(int) $row['active_guests'],
 			$activeSince,
 			$lastActivity,