wrong controller name strategy

The first of all thank you so much for the awesome module. I have found a bug during implementation your module into my project. The ControllerName strategy method shouldCache doesn't work.
This piece of code always return null:
$event->getControllerClass()

I'm sure that we need to use this code:
$routeMatch = $event->getRouteMatch();
$controller = $routeMatch->getParam('controller');