cannot join environment: Invalid argument (after update)

[Markus Trippelsdorf]

I updated to version 1.0 and now get the following error:
bogofilter[898]: cannot join environment: Invalid argument
(the number changes)

I did run "bogoutil --db-remove-environment ~/.bogofilter" before the
update and switched from Berkeley DB 4.3 to 4.4.
Bogofilter seems to function normally, but is there a way to get rid of
this error message?
-- 
Markus