diff --git a/server/src/main/java/au/org/aodn/ogcapi/server/core/mapper/StacToCollections.java b/server/src/main/java/au/org/aodn/ogcapi/server/core/mapper/StacToCollections.java
index c7052c67..cd3c5887 100644
--- a/server/src/main/java/au/org/aodn/ogcapi/server/core/mapper/StacToCollections.java
+++ b/server/src/main/java/au/org/aodn/ogcapi/server/core/mapper/StacToCollections.java
@@ -2,9 +2,7 @@
 
 import au.org.aodn.ogcapi.features.model.Collection;
 import au.org.aodn.ogcapi.features.model.Collections;
-import au.org.aodn.ogcapi.features.model.Link;
 import au.org.aodn.ogcapi.server.core.model.ExtendedCollections;
-import au.org.aodn.ogcapi.server.core.model.StacCollectionModel;
 import au.org.aodn.ogcapi.server.core.service.ElasticSearch;
 import org.mapstruct.Mapper;
 import org.springframework.beans.factory.annotation.Value;
@@ -28,7 +26,9 @@ public Collections convert(ElasticSearch.SearchResult model) {
 
         ExtendedCollections result = new ExtendedCollections();
         result.setTotal(model.getTotal());
-        result.setSearchAfter(model.getSortValues().stream().map(String::valueOf).toList());
+        if(model.getSortValues() != null) {
+            result.setSearchAfter(model.getSortValues().stream().map(String::valueOf).toList());
+        }
         result.setCollections(collections);
 
         return result;