java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at io.circe.Encoder$$anon$28.apply(Encoder.scala:215)
at io.circe.Encoder$$anon$28.apply(Encoder.scala:213)
at io.circe.ProductEncoders$$anon$3.encodeObject(ProductEncoders.scala:38)
at io.circe.ObjectEncoder.apply(ObjectEncoder.scala:13)
at io.circe.ObjectEncoder.apply$(ObjectEncoder.scala:13)
at io.circe.ProductEncoders$$anon$3.apply(ProductEncoders.scala:35)
at io.circe.syntax.package$EncoderOps$.asJson$extension(package.scala:8)
at com.marcoy.circe.nested.NestedExample$.main(NestedExample.scala:36)
at com.marcoy.circe.nested.NestedExample.main(NestedExample.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)

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