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java.lang.NullPointerException: 	at org.springframework.data.neo4j.support.mapping.EntityStateHandler.getId(EntityStateHandler.java:89)	at org.springframework.data.neo4j.support.mapping.EntityStateHandler.getPersistentState(EntityStateHandler.java:108)	at org.springframework.data.neo4j.support.mapping.EntityStateHandler.equals(EntityStateHandler.java:288)	at org.springframework.data.neo4j.aspects.support.node.Neo4jNodeBacking.ajc$interMethod$org_springframework_data_neo4j_aspects_support_node_Neo4jNodeBacking$org_springframework_data_neo4j_aspects_core_NodeBacked$equals(Neo4jNodeBacking.aj:235)