java.util.ConcurrentModificationException: null

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java.util.ConcurrentModificationException: null
at java.util.Vector$Itr.checkForComodification(Vector.java:1184)
at java.util.Vector$Itr.next(Vector.java:1137)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:92)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)
at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:100)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)
at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)

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