OpenWebMail ERROR

Session ID mbayrle*mail.jff.de-session-0.873010724390955 doesn't exist! Login again?
( ow-shared.pl:950, pid=22446, ruid=65534, euid=0, egid=65534 65534, mailgid=6 )

at /usr/local/www/cgi-bin/openwebmail/shares/ow-shared.pl line 1337.
main::openwebmailerror("/usr/local/www/cgi-bin/openwebmail/shares/ow-shared.pl", 950, "Session ID mbayrle*mail.jff.de-session-0.873010724390955 does"..., "passthrough") called at /usr/local/www/cgi-bin/openwebmail/shares/ow-shared.pl line 950
main::sessioninfo("mbayrle*mail.jff.de-session-0.873010724390955") called at /usr/local/www/cgi-bin/openwebmail/shares/ow-shared.pl line 296
main::userenv_init() called at /usr/local/www/cgi-bin/openwebmail/.openwebmail-send.pl line 73


OpenWebMail version 2.53   Help?