From da33791a2311d65ec88aaf790b57e6f2e14eb087 Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.ccom>
Date: Fri, 23 Aug 2024 21:51:25 +0800
Subject: [PATCH] fix NPE in ValueSetValidator

---
 .../hl7/fhir/validation/instance/type/ValueSetValidator.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/ValueSetValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/ValueSetValidator.java
index 00477aceb..d71692825 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/ValueSetValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/ValueSetValidator.java
@@ -277,7 +277,7 @@ public class ValueSetValidator extends BaseValidator {
       }
       if (version == null) {
         CodeSystem cs = context.fetchCodeSystem(system);
-        if (cs != null && !CodeSystemUtilities.isExemptFromMultipleVersionChecking(system)) {
+        if (cs != null && !CodeSystemUtilities.isExemptFromMultipleVersionChecking(system) && fetcher != null) {
           Set<String> possibleVersions = fetcher.fetchCanonicalResourceVersions(null, valContext.getAppContext(), system);
           warning(errors, NO_RULE_DATE, IssueType.INVALID,  stack, possibleVersions.size() <= 1, I18nConstants.TYPE_SPECIFIC_CHECKS_DT_CANONICAL_MULTIPLE_POSSIBLE_VERSIONS, 
               system, cs.getVersion(), CommaSeparatedStringBuilder.join(", ", Utilities.sorted(possibleVersions)));