NullPointerException in request.getParameter()

247958 [BoundedThreadPool0-1] ERROR org.mortbay.log - /isp/admin/data/index.jsp:
java.lang.NullPointerException
at org.mortbay.jetty.Request.getParameter(Request.java:574)
at org.apache.jsp.admin.data.index_jsp._jspService(index_jsp.java:56)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:285)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:239)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:423)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:350)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:221)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:539)
at org.mortbay.jetty.Server.handle(Server.java:341)
at org.mortbay.jetty.Server.handle(Server.java:311)
at org.mortbay.jetty.HttpConnection.doHandler(HttpConnection.java:355)
at org.mortbay.jetty.HttpConnection.access$1500(HttpConnection.java:38)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:598)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:487)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:196)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:293)
at org.mortbay.jetty.nio.SelectChannelConnector$HttpEndPoint.run(SelectChannelConnector.java:710)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:412)