java.lang.NullPointerException: null

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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 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 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 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 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 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 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)

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