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This exception has no message.
java.lang.NullPointerException: 	at com.couchbase.lite.Database.getRevisionHistoryDictStartingFromAnyAncestor(Database.java:1478)	at com.couchbase.lite.replicator.PusherInternal$5.onCompletion(PusherInternal.java:462)	at com.couchbase.lite.replicator.RemoteRequestRetry$1.completed(RemoteRequestRetry.java:342)	at com.couchbase.lite.replicator.RemoteRequestRetry$1.onCompletion(RemoteRequestRetry.java:301)	at com.couchbase.lite.replicator.RemoteRequest.respondWithResult(RemoteRequest.java:300)	at com.couchbase.lite.replicator.RemoteRequest.executeRequest(RemoteRequest.java:288)	at com.couchbase.lite.replicator.RemoteRequest.execute(RemoteRequest.java:165)	at com.couchbase.lite.replicator.RemoteRequest.run(RemoteRequest.java:105)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)	at java.util.concurrent.FutureTask.run(FutureTask.java:137)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:150)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:264)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)	at java.lang.Thread.run(Thread.java:856)