OCS 2.5 on Centos 7, no inventory

Hello to everyone, I'm trying to install OCS 2.5 on a dedicated vm with Centos 7.

I've the web server running and a windows client installed, but no way to get the network inventoried except the client itself.

In the logfiles I see those errors:

/var/log/ocsinventory-server/activity.log

 no error

/var/log/httpd/error_log (edited ip)

[:error] [pid 5558] [client client_ip:10217] PHP Warning:  in_array() expects parameter 2 to be array, null given in /usr/share/ocsinventory-reports/ocsreports/require/function_table_html.php on line 437, referer: http://localhost_ip/ocsreports/index.php?function=computer&head=1&systemid=1&cat=other

[:error] [pid 5558] [client client_ip:10217] PHP Warning:  in_array() expects parameter 2 to be array, null given in /usr/share/ocsinventory-reports/ocsreports/require/function_table_html.php on line 1803, referer: http://localhost_ip/ocsreports/index.php?function=computer&head=1&systemid=1&cat=other

In the client:

C:\ProgramData\OCS Inventory NG\Agent\OCSInventory.log

Starting OCS Inventory NG Agent
AGENT => Running OCS Inventory NG Agent Version 2.4.0.0

AGENT => Using OCS Inventory NG FrameWork Version 2.4.0.0

AGENT => Loading plug-in(s)

AGENT => Using network connection with Communication Server

AGENT => Using Communication Provider <OCS Inventory NG cURL Communication Provider> Version <2.4.0.0>

AGENT => Sending Prolog

AGENT => Prolog successfully sent

AGENT => Inventory required

AGENT => Launching hardware and software checks

AGENT => Sending Inventory

INVENTORY => Inventory changed since last run

AGENT => Inventory successfully sent

AGENT =>  Communication Server asked for Package Download

AGENT => Unloading communication provider

AGENT => Unloading plug-in(s)

AGENT => Execution duration: 00:00:17.

Checking google for those errors leads me to an old bug, already marked as solved.

Can anyone halp me to make it working?

Thanks in advance for any help.