| PreconditionXWiki Debian 16.7.0
 Steps to reproduce: Open different pages in different tabs (could be different users and PC)Start export to LaTex on each page
 Downoad result file
 Expecting resultResult file is downoaded
 Actual result500 error
 The same pages exported one by one - work correctly;
   StackTrace 
                               
                              
Error number 0 in 11: Uncaught exceptioncom.xpn.xwiki.XWikiException: Error number 0 in 11: Uncaught exception	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:662)	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:339)	at com.xpn.xwiki.web.LegacyActionServlet.service(LegacyActionServlet.java:112)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:122)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:61)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:132)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:769)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:359)	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:889)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1735)	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.base/java.lang.Thread.run(Thread.java:829)Caused by: java.lang.NullPointerException	at org.xwiki.contrib.latex.internal.export.LaTeXExportResourceReferenceHandler.sendExportFile(LaTeXExportResourceReferenceHandler.java:176)	at org.xwiki.contrib.latex.internal.export.LaTeXExportResourceReferenceHandler.handle(LaTeXExportResourceReferenceHandler.java:143)	at org.xwiki.resource.internal.DefaultResourceReferenceHandlerChain.handleNext(DefaultResourceReferenceHandlerChain.java:79)	at org.xwiki.resource.internal.AbstractResourceReferenceHandlerManager.handle(AbstractResourceReferenceHandlerManager.java:82)	at org.xwiki.resource.internal.entity.EntityResourceReferenceHandler.handle(EntityResourceReferenceHandler.java:71)	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:614)	... 44 more
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