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java.lang.NullPointerException: e at java.util.Objects.requireNonNull( at reactor.util.concurrent.SpscArrayQueue.offer( at reactor.core.publisher.FluxMergeSequential$MergeSequentialMain.innerNext( at reactor.core.publisher.FluxMergeSequential$MergeSequentialInner.onNext( at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(