java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.exist.xquery.tei.graphing.Visualization.parseListPersonGroup(Visualization.java:527)
at org.exist.xquery.tei.graphing.Visualization.parseListPersons(Visualization.java:224)
at org.exist.xquery.tei.graphing.Visualization.parseNamesDates(Visualization.java:189)
at org.exist.xquery.tei.graphing.Visualization.eval(Visualization.java:119)
at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)
at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:41)
at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)
at org.exist.xquery.LetExpr.eval(LetExpr.java:111)
at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
at org.exist.xquery.PathExpr.eval(PathExpr.java:276)
at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
at org.exist.xquery.XQuery.execute(XQuery.java:253)
at org.exist.xquery.XQuery.execute(XQuery.java:185)
at org.exist.http.servlets.XQueryServlet.process(XQueryServlet.java:470)
at org.exist.http.servlets.XQueryServlet.doPost(XQueryServlet.java:191)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:566)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:159)
at org.exist.http.urlrewrite.Forward.doRewrite(Forward.java:50)
at org.exist.http.urlrewrite.XQueryURLRewrite.doRewrite(XQueryURLRewrite.java:545)
at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:349)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)
at de.betterform.agent.web.filter.XFormsFilter.doFilter(XFormsFilter.java:171)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:396)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at org.eclipse.jetty.server.Server.handle(Server.java:524)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:319)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at java.lang.Thread.run(Thread.java:745)

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