500 Servlet Exception

java.lang.NumberFormatException: For input string: "4 X 10"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1224)
	at java.lang.Float.valueOf(Float.java:360)
	at java.lang.Float.<init>(Float.java:461)
	at dk.juuls.siab.util.Utilities$4.compare(Utilities.java:153)
	at java.util.Arrays.mergeSort(Arrays.java:1284)
	at java.util.Arrays.mergeSort(Arrays.java:1296)
	at java.util.Arrays.mergeSort(Arrays.java:1295)
	at java.util.Arrays.mergeSort(Arrays.java:1296)
	at java.util.Arrays.sort(Arrays.java:1223)
	at java.util.Collections.sort(Collections.java:159)
	at dk.itera.siab.tags.BaseIteratorTag.orderList(BaseIteratorTag.java:143)
	at dk.itera.siab.tags.BaseIteratorTag.addEmbeddedComparator(BaseIteratorTag.java:345)
	at dk.itera.siab.tags.OrderTag.doEndTag(OrderTag.java:76)
	at _jsp._stand_22dalone._shop__jsp._jspService(stand-alone/shop.jsp:151)
	at dk.itera.siab.servlet.SIABBaseServlet.handle(SIABBaseServlet.java:300)
	at dk.itera.siab.servlet.SIABUserBaseServlet.check(SIABUserBaseServlet.java:327)
	at dk.itera.siab.servlet.SIABUserBaseServlet.doGet(SIABUserBaseServlet.java:225)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.jsp.WrapperPage.service(WrapperPage.java:111)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:927)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:864)
	at dk.itera.siab.tags.LayoutTag.doEndTag(LayoutTag.java:71)
	at _jsp._siab__jsp._jspService(siab.jsp:253)
	at dk.itera.siab.servlet.SIABBaseServlet.handle(SIABBaseServlet.java:300)
	at dk.itera.siab.servlet.SIABUserBaseServlet.check(SIABUserBaseServlet.java:327)
	at dk.itera.siab.servlet.SIABUserBaseServlet.doGet(SIABUserBaseServlet.java:225)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.jsp.WrapperPage.service(WrapperPage.java:111)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
	at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
	at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:927)
	at _jsp._user__jsp._jspService(user.jsp:19)
	at dk.itera.siab.servlet.SIABUserBaseServlet.proceed(SIABUserBaseServlet.java:367)
	at dk.itera.siab.servlet.SIABUserBaseServlet.check(SIABUserBaseServlet.java:316)
	at dk.itera.siab.servlet.SIABUserBaseServlet.doGet(SIABUserBaseServlet.java:225)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.jsp.WrapperPage.service(WrapperPage.java:111)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:106)
	at dk.itera.siab.servlet.SIABUserBaseServlet.check(SIABUserBaseServlet.java:320)
	at dk.itera.siab.servlet.SIABUserBaseServlet.doGet(SIABUserBaseServlet.java:225)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.jsp.WrapperPage.service(WrapperPage.java:111)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:106)
	at dk.itera.siab.servlet.GetPageServlet.service(GetPageServlet.java:71)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:420)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:516)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
	at java.lang.Thread.run(Thread.java:595)