[syslog-ng] lib/ivykis submodule pointing to stale commit?

[Conrad Hoffmann]

Hi folks,

apparently the commit that lib/ivykis submodule is set to
(syslog-ng-3.4, master branch) does not exist in the tree anymore?
GitHub actually still shows it, but it's not checked out:

(See lines beginning with *)

 dionysos:~/tmp $>git clone https://github.com/balabit/syslog-ng-3.4.git
 Cloning into 'syslog-ng-3.4'...
 remote: Counting objects: 13157, done.
 remote: Compressing objects: 100% (2834/2834), done.
 remote: Total 13157 (delta 10256), reused 13100 (delta 10213)
 Receiving objects: 100% (13157/13157), 3.18 MiB | 1.12 MiB/s, done.
 Resolving deltas: 100% (10256/10256), done.
 dionysos:~/tmp $>cd syslog-ng-3.4/
 dionysos:~/tmp/syslog-ng-3.4 $>git submodule init
 Submodule 'lib/ivykis' (git://github.com/buytenh/ivykis.git) registered
for path 'lib/ivykis'
 Submodule 'modules/afmongodb/libmongo-client'
(git://git.balabit.hu/bazsi/libmongo-client.git) registered for path
'modules/afmongodb/libmongo-client'
 dionysos:~/tmp/syslog-ng-3.4 $>git submodule update
 Cloning into 'lib/ivykis'...
 remote: Counting objects: 3678, done.
 remote: Compressing objects: 100% (917/917), done.
 remote: Total 3678 (delta 2764), reused 3635 (delta 2732)
 Receiving objects: 100% (3678/3678), 1.06 MiB | 682 KiB/s, done.
 Resolving deltas: 100% (2764/2764), done.
*fatal: reference is not a tree: 73c0c27a19755f700b268081a5a59acdd04b421e
 Cloning into 'modules/afmongodb/libmongo-client'...
 remote: Generating pack...
 remote: Done counting 4658 objects.
 remote: Deltifying 4658 objects...
 remote:  100% (4658/4658) done
 remote: Total 4658 (delta 3123), reused 4585 (delta 3053)
 Receiving objects: 100% (4658/4658), 702.36 KiB | 1.17 MiB/s, done.
 Resolving deltas: 100% (3123/3123), done.
 Submodule path 'modules/afmongodb/libmongo-client': checked out
'58f3814cad94bcd78216c7ac971c8435d17a9242'
*Unable to checkout '73c0c27a19755f700b268081a5a59acdd04b421e' in
submodule path 'lib/ivykis'

I can't find a similar in the tree neither. Any ideas?

Regards, Conrad