XF 2.2 Error: Call to a member function getProperty() on null in src/XF/Template/Templater.php


New member
Hello everyone. Any ideas how to solve this problem?

It happens when using a specific add-on (RealTimeChat), but the developer said is probably not related to the plugin, but to the system.
Our forum has latest verion 2.2.9, almost all is clean/default, all other plugins disabled, default style.
I have also tried to re-install xenforo update, and create new style. It doesn't help.