diff --git a/dev/json-rpc.js b/dev/json-rpc.js
index 6bc9f47b..c5fcb028 100644
--- a/dev/json-rpc.js
+++ b/dev/json-rpc.js
@@ -2,13 +2,14 @@ const rpc = require('../lib/plugins/common/json-rpc')
 
 const account = {
   username: 'test',
-  password: 'test'
+  password: 'test',
+  port: 8080
 }
 
 const method = {}
 
 const params = {
-  url: 'https://httpstat.us/500'
+  // url: 'https://httpstat.us/500'
   // url: 'https://httpstat.us/400'
   // url: 'https://httpstat.us/200'
 }
diff --git a/lib/plugins/common/json-rpc.js b/lib/plugins/common/json-rpc.js
index 0636b73c..fc6b3a14 100644
--- a/lib/plugins/common/json-rpc.js
+++ b/lib/plugins/common/json-rpc.js
@@ -6,7 +6,7 @@ const _ = require('lodash/fp')
 
 module.exports = {fetch, parseConf}
 
-function fetch (account, method, params) {
+function fetch (account = {}, method = {}, params = {}) {
   return Promise.resolve(true)
     .then(() => {
       const data = {
@@ -14,6 +14,9 @@ function fetch (account, method, params) {
         params,
         id: uuid.v4()
       }
+
+      if (_.isNil(account.port)) throw new Error('port attribute required for jsonRpc')
+    
       const url = _.defaultTo(`http://localhost:${account.port}`, params.url)
 
       return axios({