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

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This exception has no message.
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This exception has no message.
at org.hibernate.engine.internal.StatefulPersistenceContext.getLoadedCollectionOwnerOrNull(
at org.hibernate.event.spi.AbstractCollectionEvent.getLoadedOwnerOrNull(
at org.hibernate.event.spi.InitializeCollectionEvent.(
at org.hibernate.internal.SessionImpl.initializeCollection(
at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(
at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(
at testhib.entities.Parent.$$_hibernate_write_children(

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