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java.lang.NullPointerException: 	at com.compomics.util.experiment.identification.ptm.ptmscores.PhosphoRS.filterSpectrum(PhosphoRS.java:842)	at com.compomics.util.experiment.identification.ptm.ptmscores.PhosphoRS.getSequenceProbabilities(PhosphoRS.java:190)	at eu.isas.peptideshaker.ptm.PtmScorer.attachProbabilisticScore(PtmScorer.java:316)	at eu.isas.peptideshaker.ptm.PtmScorer.scorePTMs(PtmScorer.java:415)	at eu.isas.peptideshaker.ptm.PtmScorer$PsmPtmScorerRunnable.run(PtmScorer.java:2363)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)