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java.lang.IllegalArgumentException: attempt to create delete event with null entity	at org.hibernate.event.spi.DeleteEvent.(DeleteEvent.java:45)	at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:801)	at org.hibernate.ejb.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:883)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365)	at com.sun.proxy.$Proxy30.remove(Unknown Source)	at com.tridion.storage.persistence.JPABaseDAO.remove(JPABaseDAO.java:145)	at com.tridion.storage.persistence.JPAItemDAO.remove(JPAItemDAO.java:246)	at com.tridion.storage.persistence.session.SessionWrapperFactory.deleteItemMeta(SessionWrapperFactory.java:184)	at com.tridion.storage.persistence.session.SessionWrapperFactory.cleanupSessionData(SessionWrapperFactory.java:161)	at com.tridion.storage.session.SessionManagerImpl.expireSession(SessionManagerImpl.java:414)	at com.tridion.storage.session.SessionManagerImpl.performCleanup(SessionManagerImpl.java:230)	at com.tridion.storage.persistence.session.SessionsCleanerMonitor.run(SessionsCleanerMonitor.java:52)	at java.lang.Thread.run(Unknown Source)