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[Neo.DatabaseError.Statement.ExecutionFailure] java.lang.NullPointerException
neo4j.DatabaseError: [Neo.DatabaseError.Statement.ExecutionFailure] java.lang.NullPointerException	at org.neo4j.cypher.internal.compiler.v2_3.pipes.NiceHasherValue.equals(NiceHasher.scala:70)	at scala.collection.mutable.FlatHashTable$class.findElemImpl(FlatHashTable.scala:128)	at scala.collection.mutable.FlatHashTable$class.containsElem(FlatHashTable.scala:121)	at scala.collection.mutable.HashSet.containsElem(HashSet.scala:40)	at scala.collection.mutable.HashSet.contains(HashSet.scala:57)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.aggregation.DistinctFunction.apply(DistinctFunction.scala:38)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.EagerAggregationPipe$$anonfun$internalCreateResults$1$$anonfun$apply$1.apply(EagerAggregationPipe.scala:84)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.EagerAggregationPipe$$anonfun$internalCreateResults$1$$anonfun$apply$1.apply(EagerAggregationPipe.scala:84)	at scala.collection.immutable.List.foreach(List.scala:381)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.EagerAggregationPipe$$anonfun$internalCreateResults$1.apply(EagerAggregationPipe.scala:84)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.EagerAggregationPipe$$anonfun$internalCreateResults$1.apply(EagerAggregationPipe.scala:80)	at scala.collection.Iterator$class.foreach(Iterator.scala:742)	at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.EagerAggregationPipe.internalCreateResults(EagerAggregationPipe.scala:80)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.PipeWithSource.createResults(Pipe.scala:125)	at org.neo4j.cypher.internal.compiler.v2_3.pipes.PipeWithSource.createResults(Pipe.scala:122)	at org.neo4j.cypher.internal.compiler.v2_3.executionplan.DefaultExecutionResultBuilderFactory$ExecutionWorkflowBuilder.createResults(DefaultExecutionResultBuilderFactory.scala:93)	at org.neo4j.cypher.internal.compiler.v2_3.executionplan.DefaultExecutionResultBuilderFactory$ExecutionWorkflowBuilder.build(DefaultExecutionResultBuilderFactory.scala:63)	at org.neo4j.cypher.internal.compiler.v2_3.executionplan.ExecutionPlanBuilder$$anonfun$getExecutionPlanFunction$1.apply(ExecutionPlanBuilder.scala:223)	at org.neo4j.cypher.internal.compiler.v2_3.executionplan.ExecutionPlanBuilder$$anonfun$getExecutionPlanFunction$1.apply(ExecutionPlanBuilder.scala:207)	at org.neo4j.cypher.internal.compiler.v2_3.executionplan.ExecutionPlanBuilder$$anon$2.run(ExecutionPlanBuilder.scala:164)	at org.neo4j.cypher.internal.compatibility.CompatibilityFor2_3$ExecutionPlanWrapper$$anonfun$run$1.apply(CompatibilityFor2_3.scala:200)	at org.neo4j.cypher.internal.compatibility.CompatibilityFor2_3$ExecutionPlanWrapper$$anonfun$run$1.apply(CompatibilityFor2_3.scala:200)	at org.neo4j.cypher.internal.compatibility.exceptionHandlerFor2_3$.runSafely(CompatibilityFor2_3.scala:116)	at org.neo4j.cypher.internal.compatibility.CompatibilityFor2_3$ExecutionPlanWrapper.run(CompatibilityFor2_3.scala:199)	at org.neo4j.cypher.internal.PreparedPlanExecution.execute(PreparedPlanExecution.scala:27)	at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:120)	at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:114)	at org.neo4j.cypher.javacompat.internal.ServerExecutionEngine.executeQuery(ServerExecutionEngine.java:62)	at org.neo4j.server.rest.transactional.TransactionHandle.executeStatements(TransactionHandle.java:328)	at org.neo4j.server.rest.transactional.TransactionHandle.commit(TransactionHandle.java:147)	at org.neo4j.server.rest.web.TransactionalService$2.write(TransactionalService.java:211)	at com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:71)	at com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:57)	at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)	at org.neo4j.server.rest.dbms.AuthorizationFilter.doFilter(AuthorizationFilter.java:116)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:497)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)	at java.lang.Thread.run(Thread.java:745)