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java.lang.NullPointerException at org.basex.data.DiskData.write(DiskData.java:136) at org.basex.data.DiskData.close(DiskData.java:151) at org.basex.core.Datas.unpin(Datas.java:54) at org.basex.core.cmd.Close.close(Close.java:45) at org.basex.query.QueryResources.close(QueryResources.java:110) at org.basex.query.QueryContext.close(QueryContext.java:596) at org.basex.query.QueryProcessor.close(QueryProcessor.java:251) at org.basex.core.cmd.AQuery.query(AQuery.java:124) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:398) at org.basex.core.Command.execute(Command.java:100) at org.basex.server.ClientListener.run(ClientListener.java:136)