[Exim] .forward and /nonexistent home directory

Hello.

Many of my users have /nonexistent home directory, but exim
is not able to work with it:

# /usr/local/sbin/exim -v -bt webclub@???
webclub@??? cannot be resolved at this time:
userforward director failed to stat /nonexistent (No such file or directory)

How can I tell Exim not to process /nonexistent directories?

Regards, Andrey Novikov