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

java.lang.NullPointerException: 	at org.kuali.hr.time.approval.service.TimeApproveServiceImpl.getNotesForDocument(TimeApproveServiceImpl.java:585)	at org.kuali.hr.time.approval.service.TimeApproveServiceImpl.getApprovalSummaryRows(TimeApproveServiceImpl.java:237)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)	at $Proxy426.getApprovalSummaryRows(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)	at $Proxy427.getApprovalSummaryRows(Unknown Source)	at org.kuali.hr.time.approval.web.TimeApprovalAction.getApprovalRows(TimeApprovalAction.java:325)	at org.kuali.hr.time.approval.web.TimeApprovalAction.setupDocumentOnFormContext(TimeApprovalAction.java:294)	at org.kuali.hr.time.approval.web.TimeApprovalAction.loadApprovalTab(TimeApprovalAction.java:199)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)	at org.kuali.rice.kns.web.struts.action.KualiAction.dispatchMethod(KualiAction.java:168)	at org.kuali.rice.kns.web.struts.action.KualiAction.execute(KualiAction.java:129)	at org.kuali.hr.time.base.web.TkAction.execute(TkAction.java:43)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor$1.doInTransaction(KualiRequestProcessor.java:486)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.processActionPerform(KualiRequestProcessor.java:482)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.processFormActionAndForward(KualiRequestProcessor.java:215)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.strutsProcess(KualiRequestProcessor.java:202)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:89)	at org.kuali.hr.time.web.TKRequestProcessor.process(TKRequestProcessor.java:31)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)	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:78)	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:89)	at org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:77)	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:271)	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:264)	at org.kuali.rice.kew.web.BootstrapFilter.doFilter(BootstrapFilter.java:162)	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.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:193)	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 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	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.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)	at java.lang.Thread.run(Thread.java:662)