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java.lang.NullPointerException: 	at java.math.BigDecimal.compareTo(BigDecimal.java:2542)	at org.kuali.hr.time.shiftdiff.rule.service.ShiftDifferentialRuleServiceImpl.processShiftDifferentialRules(ShiftDifferentialRuleServiceImpl.java:300)	at sun.reflect.GeneratedMethodAccessor1872.invoke(Unknown Source)	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:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy122.processShiftDifferentialRules(Unknown Source)	at org.kuali.hr.time.rule.TkRuleControllerServiceImpl.applyRules(TkRuleControllerServiceImpl.java:30)	at org.kuali.hr.time.missedpunch.service.MissedPunchServiceImpl.buildTimeBlockRunRules(MissedPunchServiceImpl.java:192)	at org.kuali.hr.time.missedpunch.service.MissedPunchServiceImpl.addClockLogForMissedPunch(MissedPunchServiceImpl.java:109)	at org.kuali.hr.time.missedpunch.MissedPunchDocument.prepareForSave(MissedPunchDocument.java:94)	at org.kuali.rice.kns.service.impl.DocumentServiceImpl.validateAndPersistDocument(DocumentServiceImpl.java:680)	at org.kuali.rice.kns.service.impl.DocumentServiceImpl.routeDocument(DocumentServiceImpl.java:183)	at sun.reflect.GeneratedMethodAccessor1632.invoke(Unknown Source)	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:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy52.routeDocument(Unknown Source)	at org.kuali.rice.kns.web.struts.action.KualiDocumentActionBase.route(KualiDocumentActionBase.java:784)	at org.kuali.hr.time.missedpunch.MissedPunchAction.route(MissedPunchAction.java:57)	at sun.reflect.GeneratedMethodAccessor2148.invoke(Unknown Source)	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:270)	at org.kuali.rice.kns.web.struts.action.KualiAction.dispatchMethod(KualiAction.java:172)	at org.kuali.rice.kns.web.struts.action.KualiAction.execute(KualiAction.java:123)	at org.kuali.rice.kns.web.struts.action.KualiDocumentActionBase.execute(KualiDocumentActionBase.java:158)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor$1.doInTransaction(KualiRequestProcessor.java:503)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.processActionPerform(KualiRequestProcessor.java:499)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)	at org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:101)	at org.kuali.hr.time.web.TKRequestProcessor.process(TKRequestProcessor.java:40)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:92)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.kuali.rice.kew.web.DummyLoginFilter.doFilter(DummyLoginFilter.java:86)	at org.kuali.hr.time.web.TkLoginFilter.doFilter(TkLoginFilter.java:34)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.kuali.rice.kew.web.BootstrapFilterChain.doFilter(BootstrapFilter.java:273)	at org.kuali.rice.kew.web.DummyLoginFilter.doFilter(DummyLoginFilter.java:86)	at org.kuali.hr.time.web.TkLoginFilter.doFilter(TkLoginFilter.java:34)	at org.kuali.rice.kew.web.BootstrapFilterChain.doFilter(BootstrapFilter.java:266)	at org.kuali.rice.kew.web.BootstrapFilter.doFilter(BootstrapFilter.java:164)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Thread.java:619)