Hi there,

I just installed the Gitolite plugin based on the instructions here: https://github.com/opf/openproject-gitolite. 
I am using Ubuntu and have installed OpenProject as a package (Openproject Version: 8.3.1 (Mysql2), Gitolite-Version: 8.2.0).

So far Gitolite seems to be set up correctly and also the permissions seem to be correct. I also cloned Gitolite-Admin accordingly. 

hello gitolite_admin_id_rsa, this is git@[HOST] running gitolite3 v3.6.11-1-g37dfce9 on git 2.7.4

 R W	gitolite-admin
 R W	testing

Now to my problem: In OpenProject under Plugins > Gitolite > Configure I'm able to edit and save the tab "Gitolite". But if I want to save the tab "Storage", I get an Internal Server Error (500).  I get the following error here:

I, [2019-04-10T10:48:35.366090 #1896]  INFO -- : method=POST path=/settings/plugin/openproject_gitolite format=html controller=SettingsController action=plugin status=500 error='TypeError: no implicit conversion of nil into String' duration=13.27 view=0.00 db=2.69 user=1
F, [2019-04-10T10:48:35.367328 #1896] FATAL -- :   
F, [2019-04-10T10:48:35.367397 #1896] FATAL -- : TypeError (no implicit conversion of nil into String):
F, [2019-04-10T10:48:35.367443 #1896] FATAL -- :   
F, [2019-04-10T10:48:35.367487 #1896] FATAL -- : app/models/setting.rb:171:in `[]='
app/controllers/settings_controller.rb:72:in `plugin'
app/middleware/reset_current_user.rb:47:in `call'

I am not a Ruby programmer, but I tried to understand what is happening. Unfortunately without success. I would be grateful for a tip.

Thanks in advance!