From acd7a5318217b2c81b638aba4c6bf7cac00eeef4 Mon Sep 17 00:00:00 2001
From: Torben Dannhauer <torben@dannhauer.de>
Date: Thu, 14 May 2026 13:26:42 +0200
Subject: [PATCH] Fix authentication username check in versionCallback

---
 lib/Horde/Core/ActiveSync/Driver.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Horde/Core/ActiveSync/Driver.php b/lib/Horde/Core/ActiveSync/Driver.php
index 38f6651e..ec477b68 100644
--- a/lib/Horde/Core/ActiveSync/Driver.php
+++ b/lib/Horde/Core/ActiveSync/Driver.php
@@ -3229,7 +3229,7 @@ public function meetingResponse(array $response)
     public function versionCallback(Horde_ActiveSync $server)
     {
         $credentials = new Horde_ActiveSync_Credentials($server);
-        $authUsername = !empty($credentials->username)
+        $authUsername = ($credentials->username !== false && $credentials->username !== '')
             ? (string) $credentials->username
             : null;
         if ($authUsername === null) {