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java.lang.NullPointerException: null	at org.openrdf.sail.nativerdf.btree.BTree$RangeIterator.findNext(BTree.java:2166)	at org.openrdf.sail.nativerdf.btree.BTree$RangeIterator.next(BTree.java:2091)	at org.openrdf.sail.nativerdf.NativeStatementIterator.getNextElement(NativeStatementIterator.java:65)	at org.openrdf.sail.nativerdf.NativeStatementIterator.getNextElement(NativeStatementIterator.java:34)	at info.aduna.iteration.LookAheadIteration.lookAhead(LookAheadIteration.java:91)	at info.aduna.iteration.LookAheadIteration.hasNext(LookAheadIteration.java:60)	at info.aduna.iteration.ExceptionConvertingIteration.hasNext(ExceptionConvertingIteration.java:78)	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)	at info.aduna.iteration.FilterIteration.findNextElement(FilterIteration.java:79)	at info.aduna.iteration.FilterIteration.hasNext(FilterIteration.java:54)	at info.aduna.iteration.ConvertingIteration.hasNext(ConvertingIteration.java:73)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:69)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:30)	at info.aduna.iteration.LookAheadIteration.lookAhead(LookAheadIteration.java:91)	at info.aduna.iteration.LookAheadIteration.hasNext(LookAheadIteration.java:60)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:69)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:30)	at info.aduna.iteration.LookAheadIteration.lookAhead(LookAheadIteration.java:91)	at info.aduna.iteration.LookAheadIteration.hasNext(LookAheadIteration.java:60)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:69)	at org.openrdf.query.algebra.evaluation.iterator.JoinIterator.getNextElement(JoinIterator.java:30)	at info.aduna.iteration.LookAheadIteration.lookAhead(LookAheadIteration.java:91)	at info.aduna.iteration.LookAheadIteration.hasNext(LookAheadIteration.java:60)	at info.aduna.iteration.ConvertingIteration.hasNext(ConvertingIteration.java:73)	at org.openrdf.query.algebra.evaluation.iterator.OrderIterator.createIteration(OrderIterator.java:90)	at info.aduna.iteration.DelayedIteration.hasNext(DelayedIteration.java:73)	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)	at info.aduna.iteration.LimitIteration.hasNext(LimitIteration.java:73)	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)	at org.openrdf.sail.helpers.SailBaseIteration.hasNext(SailBaseIteration.java:61)	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)	at info.aduna.iteration.TimeLimitIteration.hasNext(TimeLimitIteration.java:62)	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)	at org.openrdf.repository.RepositoryConnectionTest.testOrderByQueriesAreInterruptable(RepositoryConnectionTest.java:1725)