Clear session before setup

Fixes https://github.com/owncloud/core/issues/11861

diff --git a/lib/base.php b/lib/base.php
index 58695f318493b3ddc5afdf68a9170af6edae5b9d..fb35db1e2c78f1148def9682465cee0bdf08f441 100644 (file)
--- a/lib/base.php
+++ b/lib/base.php
@@ -716,7 +716,8 @@ class OC {
                OC::loadAppClassPaths();
 
                // Check if ownCloud is installed or in maintenance (update) mode
-               if (!OC_Config::getValue('installed', false)) {
+               if (!\OC::$server->getConfig()->getSystemValue('installed', false)) {
+                       \OC::$server->getSession()->clear();
                        $controller = new OC\Core\Setup\Controller(\OC::$server->getConfig());
                        $controller->run($_POST);
                        exit();