A network server using https is reporting an Apache Wicket error PageExpiredException ONLY when Opera browser connects. It is running QuickBuild version 9.0. The Java exception generated is as follows:

2019-06-25 15:21:58,361 [qtp1518775072-73] ERROR com.pmease.quickbuild.web.WicketConfig - Error handling wicket request.
org.apache.wicket.WicketRuntimeException: Exception in rendering component: [ [Component id = notNull]]
at org.apache.wicket.Component.internalRenderComponent(Component.java:2556)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1576)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2284)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1474)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1638)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1613)
at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:729)
at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.renderAssociatedMarkup(AssociatedMarkupSourcingStrategy.java:76)
at org.apache.wicket.markup.html.panel.PanelMarkupSourcingStrategy.onComponentTagBody(PanelMarkupSourcingStrategy.java:112)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1576)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2284)
at org.apache.wicket.markup.repeater.AbstractRepeater.renderChild(AbstractRepeater.java:110)
at org.apache.wicket.markup.repeater.AbstractRepeater.onRender(AbstractRepeater.java:97)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2284)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1474)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1638)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1613)
at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1567)
at org.apache.wicket.markup.html.panel.FragmentMarkupSourcingStrategy.onComponentTagBody(FragmentMarkupSourcingStrategy.java:83)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1576)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2284)
at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget.java:983)
at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:794)
at org.apache.wicket.ajax.AjaxRequestTarget.constructResponseBody(AjaxRequestTarget.java:672)
at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:633)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:719)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:63)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:96)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:210)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:253)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:162)
at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at com.pmease.quickbuild.web.MainServlet.service(MainServlet.java:135)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:867)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623)
at com.pmease.quickbuild.Quickbuild$DisableTraceFilter.doFilter(Quickbuild.java:1183)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:753)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:502)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:411)
at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:305)
at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:159)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at com.pmease.quickbuild.web.component.build.BuildLink.onComponentTag(BuildLink.java:95)
at com.pmease.quickbuild.web.component.build.BuildInfoPanel$5.onComponentTag(BuildInfoPanel.java:90)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2500)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1576)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2284)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1474)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1638)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1613)
at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1567)
at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:72)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)