Display back to login in error page

diff --git a/core/templates/error.php b/core/templates/error.php

index 2e5488ae8d..09fbc1e7c4 100644

--- a/core/templates/error.php

+++ b/core/templates/error.php

@@ -1,13 +1,17 @@

 <div class="guest-box">

-	<h2><?php p($l->t('Error')) ?></h2>

-	<ul>

-	<?php foreach ($_["errors"] as $error):?>

-		<li>

-			<p><?php p($error['error']) ?></p>

-			<?php if (isset($error['hint']) && $error['hint']): ?>

-				<p class='hint'><?php p($error['hint']) ?></p>

-			<?php endif;?>

-		</li>

-	<?php endforeach ?>

-	</ul>

+        <h2><?php p($l->t('Error')) ?></h2>

+        <ul>

+        <?php foreach ($_["errors"] as $error):?>

+                <li>

+                        <p><?php p($error['error']) ?></p>

+                        <?php if (isset($error['hint']) && $error['hint']): ?>

+                                <p class='hint'><?php p($error['hint']) ?></p>

+                        <?php endif;?>

+                </li>

+        <?php if ($error['statusCode'] == 401) $displayBackToLogin = true; ?>

+        <?php endforeach ?>

+        </ul>

+    <?php if ($displayBackToLogin): ?>

+        <a  href="<?php print_unescaped($_['logout_url']); ?>"><?php p($l->t('Back to login')) ?></a>

+    <?php endif; ?>

 </div>

diff --git a/lib/private/legacy/OC_Template.php b/lib/private/legacy/OC_Template.php

index 0c9fa1ccc0..d137c7f838 100644

--- a/lib/private/legacy/OC_Template.php

+++ b/lib/private/legacy/OC_Template.php

@@ -279,7 +279,7 @@ class OC_Template extends \OC\Template\Base {

 	 * @param int $statusCode

 	 * @suppress PhanAccessMethodInternal

 	 */

-	public static function printErrorPage($error_msg, $hint = '', $statusCode = 500) {

+	public static function printErrorPage($error_msg, $hint = '', $statusCode = 500, $logoutUrl = null) {

 		if (\OC::$server->getAppManager()->isEnabledForUser('theming') && !\OC_App::isAppLoaded('theming')) {

 			\OC_App::loadApp('theming');

 		}

@@ -293,8 +293,8 @@ class OC_Template extends \OC\Template\Base {

 		http_response_code($statusCode);

 		try {

 			$content = new \OC_Template('', 'error', 'error', false);

-			$errors = [['error' => $error_msg, 'hint' => $hint]];

-			$content->assign('errors', $errors);

+			$errors = [['error' => $error_msg, 'hint' => $hint, 'statusCode' => $statusCode]];

+			$content->assign('logout_url', $logoutUrl != null ? $logoutUrl : OC_User::getLogoutUrl(\OC::$server->getURLGenerator()));

 			$content->printPage();

 		} catch (\Exception $e) {

 			$logger = \OC::$server->getLogger();