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java.lang.NullPointerException: null key in entry:
 null=TaxaDist{taxaWithRead=0, totalDepth=0, maxTaxa=13, []}	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:235)	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:143)	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:182)	at net.maizegenetics.analysis.gbs.v2.DiscoverySNPCallerPluginV2.createReferenceTag(DiscoverySNPCallerPluginV2.java:385)	at net.maizegenetics.analysis.gbs.v2.DiscoverySNPCallerPluginV2.findAlleleByAlignment(DiscoverySNPCallerPluginV2.java:266)	at net.maizegenetics.analysis.gbs.v2.DiscoverySNPCallerPluginV2.lambda$null$65(DiscoverySNPCallerPluginV2.java:179)