From 9f00e9988c5bdc191be584b5dde56fa408192178 Mon Sep 17 00:00:00 2001
From: Eric Eastwood <contact@ericeastwood.com>
Date: Fri, 28 Dec 2018 13:52:30 -0600
Subject: [PATCH] Fix NPE when trying to call releaseCallback

Fix https://github.com/wilix-team/iohook/issues/131
---
 index.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index bee7d85c..e8214fea 100644
--- a/index.js
+++ b/index.js
@@ -164,7 +164,7 @@ class IOHook extends EventEmitter {
   /**
    * Specify that key event's `rawcode` property should be used instead of
    * `keycode` when listening for key presses.
-   * 
+   *
    * This allows iohook to be used in conjunction with other programs that may
    * only provide a keycode.
    * @param {Boolean} using
@@ -377,7 +377,9 @@ class IOHook extends EventEmitter {
 
         if (shortcutReleased) {
           // Call the released function handler
-          shortcut.releaseCallback(keysTmpArray);
+          if(shortcut.releaseCallback) {
+            shortcut.releaseCallback(keysTmpArray);
+          }
 
           // Remove this shortcut from our activate shortcuts array
           const index = this.activatedShortcuts.indexOf(shortcut);