1 files changed, 5 insertions, 2 deletions
diff --git a/apps/files_sharing/ajax/publicpreview.php b/apps/files_sharing/ajax/publicpreview.php
index 8c3085f1589..a52f522afac 100644
--- a/apps/files_sharing/ajax/publicpreview.php
+++ b/apps/files_sharing/ajax/publicpreview.php
@@ -36,7 +36,10 @@ if(!isset($linkedItem['uid_owner']) || !isset($linkedItem['file_source'])) {
 	exit;
 }
 
-$userId = $linkedItem['uid_owner'];
+$rootLinkItem = OCP\Share::resolveReShare($linkedItem);
+$userId = $rootLinkItem['uid_owner'];
+
+OCP\JSON::checkUserExists($rootLinkItem['uid_owner']);
 \OC_Util::setupFS($userId);
 \OC\Files\Filesystem::initMountPoints($userId);
 $view = new \OC\Files\View('/' . $userId . '/files');
@@ -86,4 +89,4 @@ try{
 } catch (\Exception $e) {
 	\OC_Response::setStatus(500);
 	\OC_Log::write('core', $e->getmessage(), \OC_Log::DEBUG);
-}
-\ No newline at end of file
+}