Regression

org.eclipse.tracecompass.tmf.ctf.core.tests.temp.statistics.TmfStateStatisticsTest.testHistogramQuerySmall

Stacktrace

java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:208)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at org.eclipse.tracecompass.internal.tmf.core.statesystem.backends.partial.PartialHistoryBackend.query2D(PartialHistoryBackend.java:476)
	at org.eclipse.tracecompass.statesystem.core.backend.IStateHistoryBackend.query2D(IStateHistoryBackend.java:292)
	at org.eclipse.tracecompass.internal.statesystem.core.StateSystem.query2D(StateSystem.java:665)
	at org.eclipse.tracecompass.internal.statesystem.core.StateSystem.query2D(StateSystem.java:634)
	at org.eclipse.tracecompass.tmf.core.statistics.TmfStateStatistics.histogramQuery(TmfStateStatistics.java:129)
	at org.eclipse.tracecompass.tmf.ctf.core.tests.temp.statistics.TmfStatisticsTest.testHistogramQuerySmall(TmfStatisticsTest.java:77)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.lang.Thread.run(Thread.java:833)