require_once '../lib/base.php';
-if (\OCP\Util::needUpgrade() || \OC::$server->getSystemConfig()->getValue('maintenance', false)) {
+if (\OCP\Util::needUpgrade()
+ || \OC::$server->getSystemConfig()->getValue('maintenance', false)
+ || \OC::$server->getSystemConfig()->getValue('singleuser', false)) {
// since the behavior of apps or remotes are unpredictable during
// an upgrade, return a 503 directly
OC_Response::setStatus(OC_Response::STATUS_SERVICE_UNAVAILABLE);