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:606)
	at org.hl7.fhir.r5.comparison.ProfileComparer.unionTypes(ProfileComparer.java:542)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:234)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareChildren(ProfileComparer.java:335)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:251)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compare(ProfileComparer.java:153)
	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:5153)
	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance(Publisher.java:5020)
	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1071)
	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:902)
	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:10908)