Undertow Broken pipe with JSFs f:ajax and h:inputText

Combine input text with default ajax event (leave):

<h:form id="inhaltSearch">

<h:inputText id="contentname" size="30"
value="#

{contentList.content.searchTerms}

">
<f:ajax render=":inhaltSearch" />
</h:inputText>

</h:form>

Enter value and press "Enter" (Tab works).
A short Javascript alert appears and vanishes again.

Stacktrace in Server:

14:57:59,441 ERROR [io.undertow.request] (default task-49) Blocking request failed HttpServerExchange

{ POST /.../Suche.xhtml}

: java.lang.RuntimeException: java.io.IOException: Broken pipe
at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:513)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:258)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:205)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:69)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:134)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:138)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:622)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_45]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]
Caused by: java.io.IOException: Broken pipe
at sun.nio.ch.FileDispatcherImpl.write0(Native Method) [rt.jar:1.7.0_45]
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) [rt.jar:1.7.0_45]
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) [rt.jar:1.7.0_45]
at sun.nio.ch.IOUtil.write(IOUtil.java:65) [rt.jar:1.7.0_45]
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:487) [rt.jar:1.7.0_45]
at org.xnio.nio.NioSocketConduit.write(NioSocketConduit.java:150) [xnio-nio-3.1.0.CR7.jar:3.1.0.CR7]
at io.undertow.server.protocol.http.HttpResponseConduit.write(HttpResponseConduit.java:484)
at io.undertow.conduits.ChunkedStreamSinkConduit.flush(ChunkedStreamSinkConduit.java:189)
at org.xnio.conduits.ConduitStreamSinkChannel.flush(ConduitStreamSinkChannel.java:147) [xnio-api-3.1.0.CR7.jar:3.1.0.CR7]
at io.undertow.channels.DetachableStreamSinkChannel.flush(DetachableStreamSinkChannel.java:117)
at org.xnio.channels.Channels.flushBlocking(Channels.java:63) [xnio-api-3.1.0.CR7.jar:3.1.0.CR7]
at io.undertow.servlet.spec.ServletOutputStreamImpl.close(ServletOutputStreamImpl.java:600)
at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:510)
... 9 more