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NPE at Fastapath

Hi !

My Fastpath gave me a NPE when i fill the fields of “LIVE CHAT” and clic on continue he gave the following error. I know that restarting tomcat can resolve this issue, but i can’t restart him one time per day.

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java.lang.NullPointerException at org.jivesoftware.smackx.muc.MultiUserChat.addInvitationListener(MultiUserChat.j ava:764) at com.jivesoftware.smack.workgroup.user.Workgroup.(Unknown Source) at org.jivesoftware.webchat.actions.ChatStarter.startSession(ChatStarter.java:189) at org.apache.jsp.queue_jsp._jspService(queue_jsp.java:91) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain .java:206) at org.jivesoftware.webchat.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi ngFilter.java:45) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain .java:206) at org.jivesoftware.webchat.SetupFilter.doFilter(SetupFilter.java:92) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFil terChain.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.valves.AccessLogValve.invoke(AccessLogValve.java:555) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:10 9) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11P rotocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619)