java.lang.ArithmeticException: divide by zero

[geeksville]

java.lang.ArithmeticException: divide by zero
at com.geeksville.util.ThrottleByBucket.apply(Throttled.scala:69)
at com.geeksville.andropilot.service.Speaker$$anonfun$onReceive$1.applyOrElse(Speaker.scala:76)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at com.geeksville.andropilot.service.Speaker.aroundReceive(Speaker.scala:35)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:241)
at akka.dispatch.Mailbox.run(Mailbox.scala:223)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
java.lang.ArithmeticException: divide by zero
at com.geeksville.util.ThrottleByBucket.apply(Throttled.scala:69)
at com.geeksville.andropilot.service.Speaker$$anonfun$onReceive$1.applyOrElse(Speaker.scala:76)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at com.geeksville.andropilot.service.Speaker.aroundReceive(Speaker.scala:35)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:241)
at akka.dispatch.Mailbox.run(Mailbox.scala:223)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)