java.lang.NullPointerException
	at org.hl7.fhir.r5.comparison.ProfileComparer.checkAddTypeUnion(ProfileComparer.java:595)
	at org.hl7.fhir.r5.comparison.ProfileComparer.unionTypes(ProfileComparer.java:534)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:226)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareChildren(ProfileComparer.java:327)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compareElements(ProfileComparer.java:243)
	at org.hl7.fhir.r5.comparison.ProfileComparer.compare(ProfileComparer.java:145)
	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:94)
	at org.hl7.fhir.igtools.publisher.realm.USRealmBusinessRules.finishChecks(USRealmBusinessRules.java:220)
	at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:4819)
	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance(Publisher.java:4737)
	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1010)
	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:860)
	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:10155)