I have some classes where I get the following error message when switching to the history tab:
Call: services/json/management/modcard/getcardhistory?_dc=1387279671384
------------------------------------------------------------------------
Error: java.lang.NullPointerException
at org.cmdbuild.dao.view.user.UserDataView.whereClauseForUser(UserDataView.java:232)
at org.cmdbuild.dao.view.user.UserDataView.executeQuery(UserDataView.java:212)
at org.cmdbuild.dao.view.user.UserDataView.executeQuery(UserDataView.java:59)
at org.cmdbuild.dao.view.ForwardingDataView.executeQuery(ForwardingDataView.java:157)
at org.cmdbuild.dao.query.QuerySpecsBuilder.run(QuerySpecsBuilder.java:492)
at org.cmdbuild.logic.commands.GetRelationHistory.exec(GetRelationHistory.java:28)
at org.cmdbuild.logic.data.access.DefaultDataAccessLogic.getRelationHistory(DefaultDataAccessLogic.java:148)
at sun.reflect.GeneratedMethodAccessor475.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:309)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
at $Proxy110.getRelationHistory(Unknown Source)
at org.cmdbuild.servlets.json.management.ModCard.getCardHistory(ModCard.java:442)
at sun.reflect.GeneratedMethodAccessor474.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.cmdbuild.servlets.JSONDispatcher.dispatch(JSONDispatcher.java:94)
at org.cmdbuild.servlets.JSONDispatcher.doGet(JSONDispatcher.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.cmdbuild.filters.AuthFilter.doFilter(AuthFilter.java:144)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.cmdbuild.filters.PatchManagerFilter.doFilter(PatchManagerFilter.java:33)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.cmdbuild.filters.ConfCheckFilter.doFilter(ConfCheckFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.cmdbuild.filters.TranslationFilter.doFilter(TranslationFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
What happens there and how can I correct this issue?