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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)