diff --git a/modules/binding-rest-runtime/src/main/java/org/apache/tuscany/sca/binding/rest/provider/RESTBindingInvoker.java b/modules/binding-rest-runtime/src/main/java/org/apache/tuscany/sca/binding/rest/provider/RESTBindingInvoker.java
index 01c4e28df6..e5de008fa5 100644
--- a/modules/binding-rest-runtime/src/main/java/org/apache/tuscany/sca/binding/rest/provider/RESTBindingInvoker.java
+++ b/modules/binding-rest-runtime/src/main/java/org/apache/tuscany/sca/binding/rest/provider/RESTBindingInvoker.java
@@ -141,7 +141,7 @@ public Set<Object> getSingletons() {
             }
         }
 
-        if (operation.getOutputType() != null) {
+        if (operation.getOutputType() != null && !operation.getOutputType().getLogical().isEmpty()) {
             responseType = operation.getOutputType().getLogical().get(0).getPhysical();
         } else {
             responseType = null;