I see some exceptions from crawl logs for some URLS. Any Idea ?

fetch of https://itunes.apple.com/us/app/pop-the-lock/id979100082?mt=8 failed 
with: java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer$Buffer.write(MapTask.java:1282)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer$Buffer.write(MapTask.java:1199)
        at java.io.DataOutputStream.writeByte(DataOutputStream.java:153)
        at org.apache.hadoop.io.WritableUtils.writeVLong(WritableUtils.java:264)
        at org.apache.hadoop.io.WritableUtils.writeVInt(WritableUtils.java:244)
        at org.apache.hadoop.io.Text.write(Text.java:281)
        at 
org.apache.hadoop.io.serializer.WritableSerialization$WritableSerializer.serialize(WritableSerialization.java:90)
        at 
org.apache.hadoop.io.serializer.WritableSerialization$WritableSerializer.serialize(WritableSerialization.java:77)
        at 
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1066)
        at 
org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:591)
        at 
org.apache.nutch.fetcher.Fetcher$FetcherThread.output(Fetcher.java:1052)
        at 
org.apache.nutch.fetcher.Fetcher$FetcherThread.output(Fetcher.java:991)
        at org.apache.nutch.fetcher.Fetcher$FetcherThread.run(Fetcher.java:835)
Thanks


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