OpenWebMail Error (ow-shared.pl:1243 rev 671)

Session ID does not exist:
johan@fobiazine.net*mail.fobiazine.net-session-0.459842192315595
Login again?

Software error:

Use of uninitialized value $homedir in concatenation (.) or string at /DISK5/WWW/shares/ow-shared.pl line 2284.

For help, please send mail to the webmaster (pipni@pipni.cz), giving this error message and the time and date of the error.