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java.lang.NullPointerException: 	at org.apache.catalina.connector.Request.notifyAttributeAssigned(Request.java:1555)	at org.apache.catalina.connector.Request.setAttribute(Request.java:1546)	at org.apache.catalina.connector.RequestFacade.setAttribute(RequestFacade.java:541)	at com.sun.faces.context.RequestMap.put(RequestMap.java:97)	at com.sun.faces.context.RequestMap.put(RequestMap.java:50)	at org.ajax4jsf.context.AjaxContext.getCurrentInstance(AjaxContext.java:218)	at org.ajax4jsf.context.AjaxContext.getCurrentInstance(AjaxContext.java:144)	at org.ajax4jsf.component.AjaxViewRoot.getViewId(AjaxViewRoot.java:588)	at com.sun.faces.application.NavigationHandlerImpl.getViewId(NavigationHandlerImpl.java:272)	at com.sun.faces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:159)	at com.xxCompany.xxCompanyPackage.pl.listeners.xxCompanyFilter.doFilter(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)	at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)	at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)	at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at com.infomindz.platform.pl.ClickJackFilter.doFilter(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Unknown Source)