From 317452cea2c190a1fc8ea39897cce1c948df00ab Mon Sep 17 00:00:00 2001
From: John L Chen <zuan@chromium.org>
Date: Fri, 19 Aug 2022 22:10:13 +0800
Subject: [PATCH] Fix callback not function for c2s

---
 services/gateway/gateway-service.mjs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/services/gateway/gateway-service.mjs b/services/gateway/gateway-service.mjs
index 85cafbf2..f7e0b76e 100644
--- a/services/gateway/gateway-service.mjs
+++ b/services/gateway/gateway-service.mjs
@@ -404,6 +404,11 @@ class GatewayService {
    * Called on callS2cAPI event.
    */
   _onCallC2sAPI(socket, msg, callback) {
+    if (typeof callback !== 'function') {
+      console.error('_onCallC2sAPI() callback not function');
+      return;
+    }
+
     const p = this.extMan.onC2sCalled(msg, socket.playerID);
     p.then((msg) => {
       if (typeof msg === 'object' && msg !== null && 'error' in msg && typeof msg.error === 'string') {