From 411ad70b4b7e79b5846d367461c7cd3e8777c78d Mon Sep 17 00:00:00 2001
From: Sandeep Mistry <sandeep.mistry@gmail.com>
Date: Mon, 12 Mar 2018 01:41:40 +0000
Subject: [PATCH] Check if attribute handle supports emit before calling

---
 lib/hci-socket/gatt.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/hci-socket/gatt.js b/lib/hci-socket/gatt.js
index 818e2176..bcd410a4 100644
--- a/lib/hci-socket/gatt.js
+++ b/lib/hci-socket/gatt.js
@@ -911,7 +911,9 @@ Gatt.prototype.handleWriteRequestOrCommand = function(request) {
               handleAttribute.emit('subscribe', this._mtu - 3, updateValueCallback);
             }
           } else {
-            handleAttribute.emit('unsubscribe');
+            if (handleAttribute.emit) {
+              handleAttribute.emit('unsubscribe');
+            }
           }
 
           result = ATT_ECODE_SUCCESS;