org.neo4j.ogm.metadata.MappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?)

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org.neo4j.ogm.metadata.MappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?)
at org.neo4j.ogm.session.request.SessionRequestHandler.execute(SessionRequestHandler.java:98)
at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:66)
at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:41)
at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:370)
at org.neo4j.ogm.integration.convertible.ConvertibleIntegrationTest.shouldSaveAndRetrieveEnums(ConvertibleIntegrationTest.java:66)

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