From 3394e1f148efc1c3280a4cea78fafce02a553ac4 Mon Sep 17 00:00:00 2001
From: LouisLam <louislam@users.noreply.github.com>
Date: Fri, 1 Oct 2021 15:47:51 +0800
Subject: [PATCH] fix undefined callback

---
 src/mixins/socket.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mixins/socket.js b/src/mixins/socket.js
index 3ff4ddcd2..a14771c36 100644
--- a/src/mixins/socket.js
+++ b/src/mixins/socket.js
@@ -293,6 +293,9 @@ export default {
         },
 
         getMonitorList(callback) {
+            if (! callback) {
+                callback = () => { };
+            }
             socket.emit("getMonitorList", callback);
         },