[horde] Horde4: Ingo doesn't filter

[andy at andreasmueller.net]

Hello,

I have configured Horde4 and all is running fine.

Also I have defined some rules for filtering. But if I click that  
filter button, nothing happens except a white page and this entry in  
Apache's error.log:

PHP Fatal error:  Call to a member function isEmpty() on a non-object  
in /usr/share/php/Horde/Imap/Client/Base.php on line 1884, referer:  
http:/****(my fqdn_here******/horde/ingo

No matter if I configure it for sql or preference system. This  
probably is not a problem with Ingo so I put it here in general Horde  
list.

Somebody could help me out, please?


Thanks
Andreas