[horde] imp hooks in groupware edition 1.2.4

[steffo76 at gmx.de]

Hi there,

I find the following entries in my horde.log:

HORDE [error] [imp] Guest user is not authorised for Address Book.

I think this is related to the hooks in hooks.php in imp/config which comes with the tarball being called as guest before login, if I deactivate the hooks.php, the error disappears. The question is

a) is this hook necessary (what does it do) (_prefs_hook_add_source) ?
b) if so how do I get rid of the error message ? 
c) shouldn't this be a warning instead of an error ?

Regards,
Stephan
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