NullPointerException at KualiMaintenanceDocumentAction

java.lang.NullPointerException
    at org.kuali.rice.kns.web.struts.action.KualiMaintenanceDocumentAction.refresh(KualiMaintenanceDocumentAction.java:729)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)
    at org.kuali.rice.kns.web.struts.action.KualiAction.dispatchMethod(KualiAction.java:171)
    at org.kuali.rice.kns.web.struts.action.KualiAction.execute(KualiAction.java:129)
    at org.kuali.rice.kns.web.struts.action.KualiDocumentActionBase.execute(KualiDocumentActionBase.java:176)
    at org.kuali.rice.kns.web.struts.action.KualiMaintenanceDocumentAction.execute(KualiMaintenanceDocumentAction.java:101)
    at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor$1.doInTransaction(KualiRequestProcessor.java:494)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
    at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.processActionPerform(KualiRequestProcessor.java:490)
    at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.processFormActionAndForward(KualiRequestProcessor.java:219)
    at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.strutsProcess(KualiRequestProcessor.java:206)
    at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:95)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    at org.kuali.rice.kns.web.struts.action.KualiActionServlet.process(KualiActionServlet.java:198)
    at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.kuali.rice.kew.web.UserPreferencesFilter.doFilter(UserPreferencesFilter.java:75)
    at org.kuali.rice.kew.web.UserPreferencesFilter.doFilter(UserPreferencesFilter.java:62)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:90)
    at org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.kuali.rice.kew.web.BootstrapFilterChain.doFilter(BootstrapFilter.java:277)
    at org.kuali.rice.kew.web.DummyLoginFilter.doFilter(DummyLoginFilter.java:96)
    at org.kuali.rice.kew.web.DummyLoginFilter.doFilter(DummyLoginFilter.java:55)
    at org.kuali.rice.kew.web.BootstrapFilterChain.doFilter(BootstrapFilter.java:270)
    at org.kuali.rice.kew.web.BootstrapFilter.doFilter(BootstrapFilter.java:168)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:185)
    at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:159)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.kuali.rice.krad.web.filter.HideWebInfFilter.doFilter(HideWebInfFilter.java:69)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:448)
    at org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:399)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1675)
    at java.lang.Thread.run(Thread.java:744)