[xwiki-users] Exception when printing top menu

Hello, Sometimes, the top menu disappears and is replaced by the exception below. It's new since the 4.1.3 migration. The user exists and if we're going on another page and go back, the problem disappears. It's totally random but only in the virtual wikis (not in the main instance). Any idea ? Thank you Nicolas Error number 4001 in 4: Error while parsing velocity page /templates/menuview.vm Wrapped Exception: Failed to evaluate content with id [/templates/menuview.vm] com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page /templates/menuview.vm Wrapped Exception: Failed to evaluate content with id [/templates/menuview.vm] at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:110) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1799) ... at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.proc essConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollow erWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:689) at java.lang.Thread.run(Thread.java:662) Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with id [/templates/menuview.vm] at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:243) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:184) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:105) ... 84 more Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'isWikiWatched' in class com.xpn.xwiki.plugin.watchlist.WatchListPluginApi threw exception com.xpn.xwiki.XWikiException: Error number 0 in 5: User [xwiki:XWiki.duthey] does not exists at /templates/menuview.vm[line 179, column 27] at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationExcept ion(ASTMethod.java:243) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :187) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReferenc e.java:280) at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:530) at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres sion.java:62) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:85) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:106) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:224) ... 86 more Caused by: com.xpn.xwiki.XWikiException: Error number 0 in 5: User [xwiki:XWiki.duthey] does not exists at com.xpn.xwiki.plugin.watchlist.WatchListStore.getWatchListObject(WatchLi stStore.java:555) at com.xpn.xwiki.plugin.watchlist.WatchListStore.getWatchedElements(WatchLi stStore.java:419) at com.xpn.xwiki.plugin.watchlist.WatchListPluginApi.isWikiWatched(WatchLis tPluginApi.java:206) at sun.reflect.GeneratedMethodAccessor418.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInv oke(UberspectImpl.java:395) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invok e(UberspectImpl.java:384) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :173) ... 99 more Wrapped Exception: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'isWikiWatched' in class com.xpn.xwiki.plugin.watchlist.WatchListPluginApi threw exception com.xpn.xwiki.XWikiException: Error number 0 in 5: User [xwiki:XWiki.duthey] does not exists at /templates/menuview.vm[line 179, column 27] at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationExcept ion(ASTMethod.java:243) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :187) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReferenc e.java:280) at org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen ce.java:530) at org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres sion.java:62) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:85) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:106) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:224) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:184) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:105) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1799) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1739) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:854) at sun.reflect.GeneratedMethodAccessor218.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInv oke(UberspectImpl.java:395) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invok e(UberspectImpl.java:384) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :173) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReferenc e.java:280) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference .java:369) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(Velocimacr oProxy.java:216) at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.j ava:311) at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.j ava:230) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective .java:207) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:87) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:224) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:184) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:105) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1799) at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1739) at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:854) at sun.reflect.GeneratedMethodAccessor218.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInv oke(UberspectImpl.java:395) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invok e(UberspectImpl.java:384) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :173) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReferenc e.java:280) at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference .java:369) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(Velocimacr oProxy.java:216) at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.j ava:311) at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.j ava:230) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective .java:207) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72 ) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState ment.java:106) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav a:342) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:224) at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci tyEngine.java:184) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere r.java:105) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1799) at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:155) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:241) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilt er.java:144) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: 66) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter. doFilter(SavedRequestRestorerFilter.java:208) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter. doFilter(SetCharacterEncodingFilter.java:111) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:215) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:174) 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:1 51) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:87 4) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.proc essConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollow erWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:689) at java.lang.Thread.run(Thread.java:662) Caused by: com.xpn.xwiki.XWikiException: Error number 0 in 5: User [xwiki:XWiki.duthey] does not exists at com.xpn.xwiki.plugin.watchlist.WatchListStore.getWatchListObject(WatchLi stStore.java:555) at com.xpn.xwiki.plugin.watchlist.WatchListStore.getWatchedElements(WatchLi stStore.java:419) at com.xpn.xwiki.plugin.watchlist.WatchListPluginApi.isWikiWatched(WatchLis tPluginApi.java:206) at sun.reflect.GeneratedMethodAccessor418.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInv oke(UberspectImpl.java:395) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invok e(UberspectImpl.java:384) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java :173) ... 99 more