diff --git a/Program.cs b/Program.cs
index 406cd05..a2cce72 100644
--- a/Program.cs
+++ b/Program.cs
@@ -404,7 +404,7 @@ namespace Tesses.YouTubeDownloader2025Companion
                 var authHdr = auth.Split(' ', 2, StringSplitOptions.RemoveEmptyEntries);
                 var cfg = Config ?? new AuthConfig();
 
-                if (!string.IsNullOrWhiteSpace(cfg.Session) && (authHdr.Length == 2 && authHdr[0] == "TYTD" && cfg.SSOAppKey == authHdr[1]))
+                if (string.IsNullOrWhiteSpace(cfg.Session) || (authHdr.Length == 2 && authHdr[0] == "TYTD" && cfg.SSOAppKey == authHdr[1]))
                 {
                     try
                     {