Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.RangeCheck(Unknown Source)
        at java.util.ArrayList.get(Unknown Source)
        at org.drools.planner.benchmark.core.statistic.bestscore.BestScoreProblemStatistic.writeGraphStatistic(BestScoreProblemStatistic.java:120)
        at org.drools.planner.benchmark.core.statistic.AbstractProblemStatistic.writeStatistic(AbstractProblemStatistic.java:82)
        at org.drools.planner.benchmark.core.statistic.BenchmarkReport.writeReport(BenchmarkReport.java:138)
        at org.drools.planner.benchmark.core.DefaultPlannerBenchmark.benchmarkingEnded(DefaultPlannerBenchmark.java:295)
        at org.drools.planner.benchmark.core.DefaultPlannerBenchmark.benchmark(DefaultPlannerBenchmark.java:174)