If I try to get the current version of the PlantUML web server as "ASCII art", it returns a java.lang.IllegalStateException.
@startuml
title %version()
@enduml
http://www.plantuml.com/plantuml/txt/SoWkIImgAStDuIh9BCb9LL0jIoqgpipFqz3aSaZDIm5A0000
java.lang.IllegalStateException: net.sourceforge.plantuml.posimo.Cluster@5f6e833a
at net.sourceforge.plantuml.posimo.DotxMaker.printCluster(DotxMaker.java:77)
at net.sourceforge.plantuml.posimo.DotxMaker.createDotString(DotxMaker.java:64)
at net.sourceforge.plantuml.posimo.GraphvizSolverB.solve(GraphvizSolverB.java:89)
at net.sourceforge.plantuml.cucadiagram.dot.CucaDiagramTxtMaker.<init>(CucaDiagramTxtMaker.java:116)
at net.sourceforge.plantuml.baraye.CucaDiagram.createFilesTxt(CucaDiagram.java:670)
at net.sourceforge.plantuml.baraye.CucaDiagram.exportDiagramInternal(CucaDiagram.java:612)
at net.sourceforge.plantuml.classdiagram.ClassDiagram.exportDiagramInternal(ClassDiagram.java:188)
at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:135)
at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:179)
at net.sourceforge.plantuml.servlet.DiagramResponse.sendDiagram(DiagramResponse.java:159)
at net.sourceforge.plantuml.servlet.UmlDiagramService.doGet(UmlDiagramService.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:717)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1644)
at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:164)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1615)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:550)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1110)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:479)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1044)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:459)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:281)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$1.run(AbstractConnection.java:505)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.base/java.lang.Thread.run(Thread.java:832)
