From 5d29a88552deb0009008defe7381db6bc28b477c Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.ccom>
Date: Mon, 5 Dec 2022 17:27:43 +1100
Subject: [PATCH] fix npe appending slashes

---
 .../src/main/java/org/hl7/fhir/utilities/Utilities.java        | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
index 4e2485c1b..f27c4ff54 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
@@ -477,6 +477,9 @@ public class Utilities {
   }
 
   public static String appendForwardSlash(String definitions) {
+    if (definitions == null) {
+      return "/";
+    }
     return definitions.endsWith("/") ? definitions : definitions + "/";
   }