Jira issue originally created by user benjamin:
When we serialize entities in a session, we often have pointers to uninitialized proxies.
These proxies have $_entityPersister == null.
The problem is that if you happen to call by mistake a method on such a proxy, you're not aware that this is an uninitialized proxy, and the business methods are called, with null values for every property.
I think the proxy should throw an exception in that case.
Attached, a patch with the proposed modification.
Imported 1 attachments from Jira into https://gist.github.com/a7e685bcdb14ef1ce066