java.lang.NullPointerException: Cannot invoke "org.hl7.fhir.r5.comparison.StructureDefinitionComparer$ProfileComparison.getUnion()" because "compP" is null
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.checkAddTypeUnion(StructureDefinitionComparer.java:910)
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.unionTypes(StructureDefinitionComparer.java:846)
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:270)
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareChildren(StructureDefinitionComparer.java:374)
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:287)
	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:167)
	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:100)
	at org.hl7.fhir.igtools.publisher.comparators.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:257)
	at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:5740)
	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance(Publisher.java:5577)
	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1109)
	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:956)
	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:11928)