From b1ae709e46b082c6300e0ca79fa37b37fbe28f2b Mon Sep 17 00:00:00 2001
From: Robin Appelman <robin@icewind.nl>
Date: Thu, 1 Oct 2026 17:56:57 +0200
Subject: [PATCH] fix: don't try to load keys for empty path for groupfolder
 versions

Signed-off-by: Robin Appelman <robin@icewind.nl>
---
 apps/encryption/lib/Crypto/Encryption.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/apps/encryption/lib/Crypto/Encryption.php b/apps/encryption/lib/Crypto/Encryption.php
index ab4406b648606..34196baf4d789 100644
--- a/apps/encryption/lib/Crypto/Encryption.php
+++ b/apps/encryption/lib/Crypto/Encryption.php
@@ -511,7 +511,9 @@ protected function getPathToRealFile($path) {
 		if ($parts[2] === 'files_versions') {
 			$realPath = '/' . $parts[1] . '/files/' . implode('/', array_slice($parts, 3));
 			$length = strrpos($realPath, '.');
-			$realPath = substr($realPath, 0, $length);
+			if ($length !== false) {
+				$realPath = substr($realPath, 0, $length);
+			}
 		}
 
 		return $realPath;