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java.lang.NullPointerException: 	at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphVertexStep.flatMap(JanusGraphVertexStep.java:109)	at org.apache.tinkerpop.gremlin.process.traversal.step.map.FlatMapStep.processNextStart(FlatMapStep.java:47)	at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphVertexStep.processNextStart(JanusGraphVertexStep.java:102)	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:140)	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:54)	at org.apache.tinkerpop.gremlin.process.traversal.step.map.MatchStep$MatchEndStep.processNextStart(MatchStep.java:460)	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:140)	at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:147)	at org.apache.tinkerpop.gremlin.process.traversal.step.map.MatchStep.standardAlgorithm(MatchStep.java:313)	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ComputerAwareStep.processNextStart(ComputerAwareStep.java:47)	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:140)	at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:147)	at org.apache.tinkerpop.gremlin.console.Console$_closure3.doCall(Console.groovy:182)