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java.lang.NullPointerException: 	at	at	at org.basex.core.Datas.unpin(	at org.basex.core.cmd.Close.close(	at org.basex.query.QueryResources.close(	at org.basex.query.QueryContext.close(	at org.basex.query.QueryProcessor.close(	at org.basex.core.cmd.AQuery.query(	at	at	at org.basex.core.Command.execute(	at