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)