java.lang.NullPointerException: Cannot invoke "org.hl7.fhir.r5.comparison.ProfileComparer$ProfileComparison.getUnion()" because "compP" is null
	at org.hl7.fhir.r5.comparison.ProfileComparer.checkAddTypeUnion(ProfileComparer.java:610)
	at org.hl7.fhir.r5.comparison.ProfileComparer.unionTypes(ProfileComparer.java:546)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:238)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareChildren(ProfileComparer.java:339)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:255)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compare(ProfileComparer.java:157)
	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:96)
	at org.hl7.fhir.igtools.publisher.comparators.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:256)
	at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:5647)
	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance(Publisher.java:5484)
	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1080)
	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:927)
	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:11693)
	at org.hl7.fhir.igtools.web.PublicationProcess.runBuild(PublicationProcess.java:874)
	at org.hl7.fhir.igtools.web.PublicationProcess.doPublish(PublicationProcess.java:474)
	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner2(PublicationProcess.java:391)
	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner(PublicationProcess.java:232)
	at org.hl7.fhir.igtools.web.PublicationProcess.publish(PublicationProcess.java:125)
	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:11446)