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java.lang.NullPointerException: 	at com.google.protobuf.UnmodifiableLazyStringList.size(UnmodifiableLazyStringList.java:61)	at java.util.AbstractList.add(AbstractList.java:108)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:134)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:40)	at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:708)	at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)