java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException

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java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException
at org.hsqldb.index.NodeAVLDisk.getLeft(Unknown Source)
at org.hsqldb.index.IndexAVL.firstRow(Unknown Source)
at org.hsqldb.RangeVariable$RangeIteratorMain.initialiseIterator(Unknown Source)
at org.hsqldb.RangeVariable$RangeIteratorMain.next(Unknown Source)
at org.hsqldb.QuerySpecification.buildResult(Unknown Source)
at org.hsqldb.QuerySpecification.getSingleResult(Unknown Source)
at org.hsqldb.QuerySpecification.getResult(Unknown Source)
at org.hsqldb.TableDerived.materialise(Unknown Source)
at org.hsqldb.TableDerived.materialiseCorrelated(Unknown Source)
at org.hsqldb.Expression.getValue(Unknown Source)
at org.hsqldb.ExpressionLogical.getValue(Unknown Source)
at org.hsqldb.Expression.testCondition(Unknown Source)
at org.hsqldb.RangeVariable$RangeIteratorMain.findNext(Unknown Source)
at org.hsqldb.RangeVariable$RangeIteratorMain.next(Unknown Source)
at org.hsqldb.QuerySpecification.buildResult(Unknown Source)
at org.hsqldb.QuerySpecification.getSingleResult(Unknown Source)
at org.hsqldb.QuerySpecification.getResult(Unknown Source)

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