zendframework/zf2 — pull request #3793 by mwillbanks (2013-02-15 17:02:10+00:00)
Title: Resolved Issue: #3748 - offsetGet and __get should do a direct proxy to $_SESSION

Basically; this fixes an oversight on my part here; it should have returned a null reference to begin with but the actual intended behavior with $_SESSION is slightly different and actually works best by doing a direct proxy.