PHP Fatal error in SAML2Authenticate.php

I’m trying to implement SSO With Active Directory’s ADFS on SuiteCRM 7.8.5
All actions are made according to this page
My crm installed on Centos 7 + apache 2.4.6 + php 5.4.16

When all setting applyed, I get “HTTP 500” error on crm logon page and message in ssl_error_log

PHP Fatal error:  Can't use method return value in write context in /var/www/html/modules/Users/authentication/SAML2Authenticate/SAML2Authenticate.php on line 136

Have no clue how to investigate this issue… what am i missing? some php or system pkgs? settings? or else? What docs should I read?

Any hints, thoughts and directions are gratefully appreciated