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java.lang.IllegalStateException: Promise already completed.	at scala.concurrent.Promise$class.complete(Promise.scala:55)	at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153)	at scala.concurrent.Promise$class.success(Promise.scala:86)	at scala.concurrent.impl.Promise$DefaultPromise.success(Promise.scala:153)	at monix.reactive.internal.builders.Zip2Observable.monix$reactive$internal$builders$Zip2Observable$$signalOnComplete$1(Zip2Observable.scala:126)	at monix.reactive.internal.builders.Zip2Observable$$anon$1.onComplete(Zip2Observable.scala:151)	at monix.reactive.internal.builders.Zip2Observable.monix$reactive$internal$builders$Zip2Observable$$rawOnComplete$1(Zip2Observable.scala:104)	at monix.reactive.internal.builders.Zip2Observable$$anonfun$monix$reactive$internal$builders$Zip2Observable$$signalOnComplete$1$1.apply(Zip2Observable.scala:120)	at monix.reactive.internal.builders.Zip2Observable$$anonfun$monix$reactive$internal$builders$Zip2Observable$$signalOnComplete$1$1.apply(Zip2Observable.scala:118)