ownCloud update problem - Debian 8.7, ISPConfig 3.1.1p1 (Apache), ownCloud 9.0.4 (stable)

Hello!
I have an issue with updating ownCloud from ownCloud 9.0.4 (stable) to ownCloud 9.0.6 on ISPConfig 3.1.1p1 (Apache), Debian 8.7.
On admin page it says 'A new version is available: ownCloud 9.0.6', and when I click on 'Open updater' I get

Code:

 [UnexpectedValueException]
Could not parse a response for config:list. Please check if the current shell user can run occ command. Raw output:
Not allowed 

What to do?
Do I need to add some new Shell User via ISPConfig's interface?

 

I can see this in the website's error log

Code:

[Thu Jan 19 15:05:13.409638 2017] [authz_core:error] [pid 17107] [client xxx.xxx.xxx.xxx:58955] AH01630: client denied by server configuration: /var/www/MY.OWNCLOUD.com/web/data/htaccesstest.txt

A haven't done any changes in the php.
These are my 'Custom php.ini settings'

Code:

always_populate_raw_post_data = -1 

and 'Apache Directives'

Code:

RewriteEngine on
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [L,R]
<IfModule mod_headers.c>
      Header always set Strict-Transport-Security "max-age=15768000; includeSubDomains; preload"
    </IfModule>

 

Any thoughts on this?

 

I updated it manually, thank you.