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java.lang.NullPointerException: null	at org.openrdf.sail.nativerdf.btree.BTree$RangeIterator.findNext(BTree.java:2159)	at org.openrdf.sail.nativerdf.btree.BTree$RangeIterator.next(BTree.java:2084)	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)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)	at org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)