java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.hibernate.engine.internal.StatefulPersistenceContext.getLoadedCollectionOwnerOrNull(StatefulPersistenceContext.java:780)
at org.hibernate.event.spi.AbstractCollectionEvent.getLoadedOwnerOrNull(AbstractCollectionEvent.java:58)
at org.hibernate.event.spi.InitializeCollectionEvent.(InitializeCollectionEvent.java:22)
at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:2002)
at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:562)
at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:246)
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:558)
at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:131)
at testhib.entities.Parent.$$_hibernate_write_children(Parent.java)

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