NullPointerException on websocket connection

When connecting from chrome or firefox 6 over websockets, I get the Null pointer below. It does not happen on firefox 5 or safari . My guess would be that the chrome and ff 6 are implementing a newer version of the websocket spec that is incompatible with the version that the activemq implements.

2011-09-19 09:18:33,931 | WARN | /stomp | org.eclipse.jetty.util.log | qtp1545215993-39
java.lang.NullPointerException
at org.apache.activemq.transport.ws.StompServlet.doGet(StompServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at org.eclipse.jetty.websocket.WebSocketServlet.service(WebSocketServlet.java:73)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:527)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:423)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:930)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:358)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:866)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
at org.eclipse.jetty.server.Server.handle(Server.java:351)
at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:594)
at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1042)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:549)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:211)
at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:424)
at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:241)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
at java.lang.Thread.run(Thread.java:680)