Error with inheritance in pushka

pushka.scala

import pushka.json._
import pushka.annotation.pushka

@pushka
sealed trait TraitA

object TraitA {

  sealed trait TraitB extends TraitA

  case class Value(a: String) extends TraitB

}

write[TraitA](TraitA.Value("asdf"))

// pushka.package$PushkaException: 
// 	at involve.server.A$A79$A$A79$TraitA$$anon$1.write(1.sc:21)
// 	at involve.server.A$A79$A$A79$TraitA$$anon$1.write(1.sc:21)
// 	at pushka.json.PushkaJsonBackend$class.write(1.sc:4)
// 	at pushka.json.package$.write(1.sc)
// 	at #worksheet#.#worksheet#(1.sc:32)