Exception in push connection, how to catch and what causes this?

here is a vaadin website of mine, http://vidjay/jazz , for all kinds of mp3 music download and video conversion.

I get this exception below when visitors close their browser, even if there was no more interaction than calling the site, is this normal and where should I catch it? Has anybody had this issue?

Okt 23, 2016 11:28:20 PM com.vaadin.server.communication.PushAtmosphereHandler$AtmosphereResourceListener onThrowable
SCHWERWIEGEND: Exception in push connection
org.apache.catalina.connector.ClientAbortException: java.io.IOException: Datenübergabe unterbrochen (broken pipe)
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:389)
    at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:426)
    at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:338)
    at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:313)
    at org.apache.catalina.connector.Response.flushBuffer(Response.java:510)
    at org.apache.catalina.connector.ResponseFacade.flushBuffer(ResponseFacade.java:318)
    at javax.servlet.ServletResponseWrapper.flushBuffer(ServletResponseWrapper.java:168)
    at org.atmosphere.cpr.AtmosphereResponse.flushBuffer(AtmosphereResponse.java:485)
    at org.atmosphere.cpr.AtmosphereInterceptorWriter.flush(AtmosphereInterceptorWriter.java:102)
    at org.atmosphere.cpr.AtmosphereResponse$2.flush(AtmosphereResponse.java:589)
    at org.atmosphere.handler.AbstractReflectorAtmosphereHandler.onStateChange(AbstractReflectorAtmosphereHandler.java:149)
    at com.vaadin.server.communication.PushAtmosphereHandler.onStateChange(PushAtmosphereHandler.java:52)
    at org.atmosphere.cpr.DefaultBroadcaster.invokeOnStateChange(DefaultBroadcaster.java:1096)
    at org.atmosphere.cpr.DefaultBroadcaster.prepareInvokeOnStateChange(DefaultBroadcaster.java:1116)
    at org.atmosphere.cpr.DefaultBroadcaster.executeAsyncWrite(DefaultBroadcaster.java:921)
    at org.atmosphere.cpr.DefaultBroadcaster$3.run(DefaultBroadcaster.java:522)
    at java.util.concurrent.Executors$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)
Caused by: java.io.IOException: Datenübergabe unterbrochen (broken pipe)
    at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
    at sun.nio.ch.IOUtil.write(IOUtil.java:65)
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
    at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:127)
    at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101)
    at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:173)
    at org.apache.coyote.http11.InternalNioOutputBuffer.writeToSocket(InternalNioOutputBuffer.java:139)
    at org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:197)
    at org.apache.coyote.http11.InternalNioOutputBuffer.access$000(InternalNioOutputBuffer.java:41)
    at org.apache.coyote.http11.InternalNioOutputBuffer$SocketOutputBuffer.doWrite(InternalNioOutputBuffer.java:320)
    at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:118)
    at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:257)
    at org.apache.coyote.Response.doWrite(Response.java:492)
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:384)
    ... 20 more

If this is due arrupt closing of browser as you say, it is harmless.