When active nodes tab is not refreshed, clicking the node link that the node is not active or removed will cause below exception:

java.lang.NullPointerException
     at com.pmease.quickbuild.plugin.measurement.core.trait.NodeTraits.getFromNodeData(NodeTraits.java:255)
     at com.pmease.quickbuild.plugin.measurement.core.web.node.GridNodePanel.onInitialize(GridNodePanel.java:128)
     at org.apache.wicket.Component.fireInitialize(Component.java:924)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1002)
     at org.apache.wicket.MarkupContainer.addedComponent(MarkupContainer.java:979)
     at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:165)
     at com.pmease.quickbuild.plugin.measurement.core.web.node.ActiveNodesPanel.onInitialize(ActiveNodesPanel.java:48)
     at org.apache.wicket.Component.fireInitialize(Component.java:924)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1002)
     at org.apache.wicket.MarkupContainer.addedComponent(MarkupContainer.java:979)
     at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:165)
     at org.apache.wicket.MarkupContainer.addOrReplace(MarkupContainer.java:238)
     at com.pmease.quickbuild.web.component.tabbedpanel.TabbedPanel.selectTab(TabbedPanel.java:98)
     at com.pmease.quickbuild.web.component.tabbedpanel.TabbedPanel.onInitialize(TabbedPanel.java:184)
     at org.apache.wicket.Component.fireInitialize(Component.java:924)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1002)
     at org.apache.wicket.MarkupContainer.addedComponent(MarkupContainer.java:979)
     at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:165)
     at com.pmease.quickbuild.web.page.grid.GridPage.newCreateTabs(GridPage.java:278)
     at com.pmease.quickbuild.web.page.grid.GridPage.onInitialize(GridPage.java:154)
     at org.apache.wicket.Component.fireInitialize(Component.java:924)
     at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1002)
     at org.apache.wicket.Page.internalPrepareForRender(Page.java:278)
     at org.apache.wicket.Component.render(Component.java:2280)
     at org.apache.wicket.Page.renderPage(Page.java:1035)
     at