When a decimalbox is bind to a double and this double have the value NaN.
It's generate an exception :

014-06-27 15:50:45.566:WARN:oejs.DefaultServlet:EXCEPTION
java.lang.NumberFormatException
at java.math.BigDecimal.<init>(BigDecimal.java:470)
at java.math.BigDecimal.<init>(BigDecimal.java:739)
at org.zkoss.lang.Classes.coerce(Classes.java:1309)
at org.zkoss.bind.impl.LoadPropertyBindingImpl.load(LoadPropertyBindingImpl.java:89)
at org.zkoss.bind.impl.PropertyBindingHandler.doLoadBinding(PropertyBindingHandler.java:173)
at org.zkoss.bind.impl.PropertyBindingHandler.doLoad(PropertyBindingHandler.java:374)
at org.zkoss.bind.impl.BinderImpl.loadComponentProperties0(BinderImpl.java:2106)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2083)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2086)
at org.zkoss.bind.impl.BinderImpl.loadComponent(BinderImpl.java:2074)
at org.zkoss.bind.BindComposer$BinderKeeper$Loader.load(BindComposer.java:492)
at org.zkoss.bind.BindComposer$BinderKeeper.loadComponentForAllBinders(BindComposer.java:471)
at org.zkoss.bind.BindComposer.doAfterCompose(BindComposer.java:180)
at org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:578)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:880)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:797)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:757)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699)
at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:442)
at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:356)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:136)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:575)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:276)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:103)
at org.eclipse.jetty.servlet.DefaultServlet.doGet(DefaultServlet.java:572)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:744)

This make the page in error 500 :
HTTP ERROR 500

Problem accessing /. Reason:

Server Error

The decimalbox don't have a specified format.

Not be able to display one value shouldn't blok the all page.