Merge pull request #4492 from corentin-soriano/reset_session_upgrade

Reset session before redirect to upgrade.php.

index.php

@@ -92,6 +92,7 @@
 
 // Quick major version check -> upgrade needed?
 if (isset($SETTINGS['teampass_version']) === true && version_compare(TP_VERSION, $SETTINGS['teampass_version']) > 0) {
+    $session->invalidate();
     // Perform redirection
     if (headers_sent()) {
         echo '<script language="javascript" type="text/javascript">document.location.replace("install/install.php");</script>';