Trouble using .NET session.fileexist with FTP protocol

The code I developed works fine with vsftpd, while it doesn't with Titan FTP Server v9.12

Before uploading files, I check with the Session.FileExists method if the file already exists. On Titan FTP Server, the first call succeeds, while the second call stops with a SessionLocalExeption: Element "group" not found in the log-file.

WinSCP Version 5.1.1

I forgot to mention the same code works fine with the SFTP protocol on the same Titan FTP server.

I do not see any listing in the response to the MLST command:

You should contact Tital support.

Thanks a lot Martin for this very quick reaction.
I'll check with Titan support.

Anyway, can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

I sent you a mail today 14th November 12:00

Today I sent you a new mail with the answer of Titan support.

Today I sent you a second mail with an answer (additional information) of Titan support.

The problem is solved after the update to Titan FTP Server version 9.13 Build 1623.

Thanks a lot for your very adequate and quick support.