many agent installs work some give 500 error on server

fresh download and install of server 2.3 on linux (CentOS 7) and agent 2.3. I'm installing the agent on several linux boxes all running CentOS 7 with all updates, some work fine and report, some give a 500 server error, all have the same perl modules and all have the same ocsinventory-agent.cfg file

agent log on the client
Wed Jan 25 13:41:45 2017][error] Cannot establish communication : 500 Internal Server Error

apache error log on the server corresponding line
[Wed Jan 25 13:44:32.579981 2017] [perl:error] [pid 5489] [client xxx.xxx.xxx.xxx:45672] Not a HASH reference at /usr/local/share/perl5/Apache/Ocsinventory/Server/Inventory/Data.pm line 126.\n

and activity.log
Wed Jan 25 11:54:36 2017;5322;114;hostname-2017-01-25-13-10-39;xxx.xxx.xxx.xxx;OCS-NG_unified_unix_agent_v2.3;inventory;no_session