In php-error.log, I get:
[20-Apr-2016 21:42:19 UTC] PHP Fatal error: Call to a member function toArray() on a non-object in /var/lib/openshift/5713c9960c1e66966d00015b/app-root/runtime/repo/df/vendor/dreamfactory/df-core/src/Handlers/Events/ServiceEventHandler.php on line 149