[imp] IMP problem

[Jānis]

Hi!

after upgrade to IMP 6.0.5 I am not able to oepn letters from one  
sender (important). Apache log shows only such message:


[Mon Jun 17 19:30:56.520415 2013] [:error] [pid 24074:tid  
140506608617216] [client IP:48643] PHP Fatal error:  Call to a member  
function appendChild() on a non-object in  
/horde5/imp/lib/Mime/Viewer/Html.php on line
512, referer: https://server/imp/mailbox.php?mailbox=SU5CT1g

How can I solve the problem? Currently for html message inline display  
it true.

Janis