STOMP over Websockets do not work in Chrome

The STOMP over Websocket support does not work with both client libraries referenced from the ActiveMQ Websockets page
( http://activemq.apache.org/websockets.html ).
On the ActiveMQ side, the following error appears:

INFO | Started SelectChannelConnector@0.0.0.0:8161
ERROR | handle failed?
java.lang.IllegalArgumentException: !utf8
at org.eclipse.jetty.util.Utf8StringBuilder.append(Utf8StringBuilder.java:112)
at org.eclipse.jetty.websocket.WebSocketParser.parseNext(WebSocketParser.java:147)
at org.eclipse.jetty.websocket.WebSocketConnection.handle(WebSocketConnection.java:75)
at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:252)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
at java.lang.Thread.run(Unknown Source)