From 8556f5edbc986113ded0ad04e4b8be9d520b66d1 Mon Sep 17 00:00:00 2001
From: crusader <crusader@loafle.com>
Date: Mon, 14 Aug 2017 16:57:45 +0900
Subject: [PATCH] bug fix

---
 src/ts/@overflow/commons/websocket/WebSocketRPC.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ts/@overflow/commons/websocket/WebSocketRPC.ts b/src/ts/@overflow/commons/websocket/WebSocketRPC.ts
index 5edd904..3aad65e 100644
--- a/src/ts/@overflow/commons/websocket/WebSocketRPC.ts
+++ b/src/ts/@overflow/commons/websocket/WebSocketRPC.ts
@@ -131,8 +131,12 @@ export default class WebSocketRPC {
 
   private onResponseHandler(response: Response<ID_TYPE>): void {
       const requestID = response.ID;
-      const error = response.Error;
-      const result = JSON.parse(response.Result);
+      let error = response.Error;
+      let result;
+
+      if (undefined !== response.Result) {
+        result = JSON.parse(response.Result);
+      }
 
       if (this.requestQueue.has(requestID)) {
         let promise = this.requestQueue.get(requestID);