diff --git a/software/nosql/src/main/java/org/apache/brooklyn/entity/nosql/couchbase/CouchbaseClusterImpl.java b/software/nosql/src/main/java/org/apache/brooklyn/entity/nosql/couchbase/CouchbaseClusterImpl.java
index 1c9a37c..ed8b7ee 100644
--- a/software/nosql/src/main/java/org/apache/brooklyn/entity/nosql/couchbase/CouchbaseClusterImpl.java
+++ b/software/nosql/src/main/java/org/apache/brooklyn/entity/nosql/couchbase/CouchbaseClusterImpl.java
@@ -290,6 +290,7 @@
     private final static class ListOfHostAndPort implements Function<Set<Entity>, List<String>> {
         @Override public List<String> apply(Set<Entity> input) {
             List<String> addresses = Lists.newArrayList();
+            if (input == null) return addresses;
             for (Entity entity : input) {
                 addresses.add(String.format("%s",
                         BrooklynAccessUtils.getBrooklynAccessibleAddress(entity, entity.getAttribute(CouchbaseNode.COUCHBASE_WEB_ADMIN_PORT))));