set -u problem

Ran into an issue connectint to openssh with set -u in the users dot profile. After authenticating .. get the following error.
Error detecting variable containing retrune code of last command

Connection has been unexpectedly closed. Server sent command exit status 1.

winscp version 3.6.7 talking to openssh 3.4 and 3.8

The strange thing is the user claims this worked in the recent past and the profile had not been changed...
Any insite??
Thanks
Doug

Sorry OS is AIX 5.1 5.2 5.3 and redhat 6 or 7.. I forget what is on this box under the desk.. does it in ksh sh and bash.. with set- u in .profile and .bash_profile on linux
Doug

Have you tried using SFTP protocol?

You can also try to avoid executing the "set -u" for non-interactive sessions.

The sftp protocol worked. I told the user to remove the set, there is no reason I can find for it to be there.
Thanks!
Doug