diff --git a/src/java-client.js b/src/java-client.js
index cd4f9fa..d0e3981 100644
--- a/src/java-client.js
+++ b/src/java-client.js
@@ -61,7 +61,7 @@ function mapOperation(operation, namespace) {
     operation.responses = operation.responses.map(resp => {
         let type = javaType.mapJavaType(resp.type, namespace)
         if(resp.type !== 'unit') {
-            resp.label = `${utils.camelcase(type.baseType)}${resp.code.integer.value}`
+            resp.label = `${utils.camelcase(type.baseType || 'result')}${resp.code.integer.value}`
         }
         resp.type = type
         return resp