java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.primefaces.component.datatable.DataTable.findColumnInGroup(DataTable.java:909)
at org.primefaces.component.datatable.DataTable.findColumn(DataTable.java:900)
at org.primefaces.component.datatable.DataTable.getSortColumn(DataTable.java:1444)
at org.primefaces.component.datatable.DataTable.resolveSortField(DataTable.java:1024)
at org.primefaces.component.datatable.DataTable.loadLazyData(DataTable.java:976)
at org.primefaces.component.datatable.DataTableRenderer.preRender(DataTableRenderer.java:95)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at org.primefaces.component.tabview.TabViewRenderer.encodeTabContent(TabViewRenderer.java:311)
at org.primefaces.component.tabview.TabViewRenderer.encodeContents(TabViewRenderer.java:285)
at org.primefaces.component.tabview.TabViewRenderer.encodeMarkup(TabViewRenderer.java:132)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at org.primefaces.extensions.component.masterdetail.MasterDetailRenderer.encodeMarkup(MasterDetailRenderer.java:168)
at org.primefaces.extensions.component.masterdetail.MasterDetailRenderer.encodeEnd(MasterDetailRenderer.java:101)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:89)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:72)
at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:206)
at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:123)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582)
at javax.faces.component.UIForm.visitTree(UIForm.java:381)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:432)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at za.co.fnds.adminweb.system.filters.XSSFilter.doFilter(XSSFilter.java:34)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at za.co.fnds.adminweb.system.filters.RestrictPageFilter.doFilter(RestrictPageFilter.java:81)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at za.co.fnds.adminweb.system.filters.IECompatibilityFilter.doFilter(IECompatibilityFilter.java:40)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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