Getting java.lang.NullPointerException on ElasticSearch indexed field

Hello,

I am getting this exception when query edges

:> g.E().hasLabel('state').has('CisCode','FUTISKY').has('from',lte(1539885480000)).has('_hash','f55eae38855173399afdfc99')

[gremlin-server-exec-3] WARN  org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor  - Exception processing a script on request [RequestMessage{, requestId=5bbcf977-54d1-416e-bcac-674ca18830be, op='eval', processor='', args={gremlin=g.E().hasLabel('state').has('CisCode','FUTISKY').has('from',lte(1539885480000)).has('_hash','f55eae38855173399afdfc99'), bindings={}, batchSize=64}}].
java.lang.NullPointerException
        at org.janusgraph.graphdb.util.ElementHelper.getValues(ElementHelper.java:41)
        at org.janusgraph.graphdb.query.condition.PredicateCondition.evaluate(PredicateCondition.java:66)
        at org.janusgraph.graphdb.query.condition.And.evaluate(And.java:55)
        at org.janusgraph.graphdb.query.graph.GraphCentricQuery.matches(GraphCentricQuery.java:152)
        at org.janusgraph.graphdb.query.QueryProcessor.lambda$getFilterIterator$2(QueryProcessor.java:133)
        at com.google.common.collect.Iterators$7.computeNext(Iterators.java:652)
        at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
        at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
        at org.janusgraph.graphdb.query.ResultSetIterator.nextInternal(ResultSetIterator.java:54)
        at org.janusgraph.graphdb.query.ResultSetIterator.<init>(ResultSetIterator.java:44)
        at org.janusgraph.graphdb.query.QueryProcessor.iterator(QueryProcessor.java:66)
        at com.google.common.collect.Iterables$7.iterator(Iterables.java:613)
        at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphStep.executeGraphCentryQuery(JanusGraphStep.java:156)
        at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphStep.lambda$null$1(JanusGraphStep.java:95)
        at java.lang.Iterable.forEach(Unknown Source)
        at org.janusgraph.graphdb.tinkerpop.optimize.JanusGraphStep.lambda$new$2(JanusGraphStep.java:95)
        at org.apache.tinkerpop.gremlin.process.traversal.step.map.GraphStep.processNextStart(GraphStep.java:142)
        at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
        at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:192)
        at org.apache.tinkerpop.gremlin.server.op.AbstractOpProcessor.handleIterator(AbstractOpProcessor.java:89)
        at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor.lambda$evalOpInternal$5(AbstractEvalOpProcessor.java:252)
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$0(GremlinExecutor.java:274)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

Janusgraph: version 0.3.0

Start by reproducing the Gremlin query against the Elasticsearch-backed graph and inspect the stack-trace path at org.janusgraph.graphdb.util.ElementHelper.getValues(ElementHelper.java:41) and PredicateCondition.java:66. Trace which indexed field or missing value reaches the predicate evaluation, then verify that the query no longer raises NullPointerException.