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com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.Values[0])
java.lang.NullPointerException: null	at io.katharsis.jackson.serializer.ContainerSerializer.writeAttributes(ContainerSerializer.java:184)	at io.katharsis.jackson.serializer.ContainerSerializer.writeData(ContainerSerializer.java:105)	at io.katharsis.jackson.serializer.ContainerSerializer.serialize(ContainerSerializer.java:77)	at io.katharsis.jackson.serializer.ContainerSerializer.serialize(ContainerSerializer.java:42)	at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149)