mongodb connector throws NPE when discovering replica set on a sharded cluster

mongodb.hosts=<shard cluster config server ip>:27019
mongodb.user=admin
mongodb.password=<password>

$ /usr/bin/connect-standalone /etc/kafka/connect-standalone.properties /opt/debezium-connector-mongodb/config/mongodb-kafka-connect.properties

[2016-12-15 15:44:09,042] ERROR Task patientstore-connector-0 threw an uncaught and unrecoverable exception (org.apache.kafka.connect.runtime.WorkerTask:142)
java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1645)
	at io.debezium.connector.mongodb.SourceInfo.partition(SourceInfo.java:172)
	at io.debezium.connector.mongodb.MongoDbConnectorTask.lambda$start$1(MongoDbConnectorTask.java:119)
	at java.util.ArrayList.forEach(ArrayList.java:1249)
	at io.debezium.connector.mongodb.ReplicaSets.onEachReplicaSet(ReplicaSets.java:103)
	at io.debezium.connector.mongodb.MongoDbConnectorTask.start(MongoDbConnectorTask.java:117)
	at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:137)
	at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:140)
	at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:175)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)