From 4c3af5b9dde98689d731bc494714079f9e4bbe8e Mon Sep 17 00:00:00 2001
From: dkanada <dkanada@users.noreply.github.com>
Date: Tue, 24 Sep 2019 23:23:43 +0900
Subject: [PATCH] add check for eventListenerCount

---
 src/components/inputManager.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/components/inputManager.js b/src/components/inputManager.js
index 5261cf13b3..6190470fb5 100644
--- a/src/components/inputManager.js
+++ b/src/components/inputManager.js
@@ -22,12 +22,12 @@ define(['playbackManager', 'focusManager', 'appRouter', 'dom'], function (playba
 
     var eventListenerCount = 0;
     function on(scope, fn) {
-        eventListenerCount++;
+        if (eventListenerCount) eventListenerCount++;
         dom.addEventListener(scope, 'command', fn, {});
     }
 
     function off(scope, fn) {
-        eventListenerCount--;
+        if (eventListenerCount) eventListenerCount--;
         dom.removeEventListener(scope, 'command', fn, {});
     }
 
@@ -234,4 +234,4 @@ define(['playbackManager', 'focusManager', 'appRouter', 'dom'], function (playba
         on: on,
         off: off
     };
-});
\ No newline at end of file
+});