lftp 2.4.7 bug

[war]

I want to set a proxy for a particular session.
-c does not work either.

[war@war war]$ lftp leon -e 'set ftp:proxy "192.168.168.253:3128"'
cd ok, cwd=/home/war
lftp [EMAIL PROTECTED]:~> ls
lftp: ftpclass.cc:1351: int Ftp::Do(): Assertion `peer!=0' failed.
Aborted