500 Servlet Exception

java.lang.NumberFormatException: For input string: "LOPPU"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1224)
	at java.lang.Double.parseDouble(Double.java:482)
	at _jsp._cartop__jsp._jspService(cartop.jsp:57)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:159)
	at fi.staart.up.cms.frame.PreviewFilter.doFilter(PreviewFilter.java:52)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:178)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:419)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:389)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:492)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:425)
	at java.lang.Thread.run(Thread.java:595)

Resin Professional 3.0.18 (built Fri, 24 Feb 2006 09:15:12 PST)