Sender Channel SFTP - Exception received: java.lang.StringIndexOutOfBoundsException: String index out of range: -1

Hi, Experts

We have an issue in our SFTP to RFC scenario. The sender communication channel is showing an error when the option "Arquiving on SFTP Server" is selected (Exception received: java.lang.StringIndexOutOfBoundsException: String index out of range: -1). Below the print of configuration and the log error. We have checked the connection and it is ok, the user has full access to the directory and the file content was tested. We try to send an empty file as well but the same error occour.

Is there a module problem? Do someone have passed by the same problem?

P.S. If the option "Archive Files on SFTP Server" is unchecked the file is processed with success. 

Error log:

Thanks,

Halsen