[horde] [imp] unable to "Update respondent status"

[Pulz, Joerg]

Hi,

I get the following error when I click on "Update respondent status"  
in an email i received as response to an event invitation i sent using  
Kronolith:

EMERG: HORDE [imp] Call to a member function getHeader() on a  
non-object [pid .... on line 121 of  
"/..../horde/imp/lib/Ajax/Imple/ItipRequest.php"]

In the WebUI i only see the red box stating "Error when communicating  
with the server."

Just a note, the event response email is generated by Horde itself.

This is with latest GIT (pulled just minutes ago from github).

Any hint or fix is much appreciated.

Kind regards
Joerg
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