A strange exception while consumption using a multi topic Kafka Connector

[Vishal Santoshi]

java.util.ConcurrentModificationException
        at 
java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
        at java.util.LinkedList$ListItr.next(LinkedList.java:888)
        at 
org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.runFetchLoop(Kafka09Fetcher.java:134)

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This flink 1.4.0

Any ideas folks ?