From 2fc41e7045c0aa424f2da406a8eff40c9183874e Mon Sep 17 00:00:00 2001
From: Hyunje Alex Jun <me@noraesae.net>
Date: Thu, 5 Feb 2015 19:18:35 +0000
Subject: [PATCH] Add a guard to check if activeElement exists.

---
 src/perfect-scrollbar.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/perfect-scrollbar.js b/src/perfect-scrollbar.js
index 98c44ac..a6861ae 100644
--- a/src/perfect-scrollbar.js
+++ b/src/perfect-scrollbar.js
@@ -470,12 +470,15 @@
           }
 
           var activeElement = document.activeElement ? document.activeElement : ownerDocument.activeElement;
-          // go deeper if element is a webcomponent
-          while (activeElement.shadowRoot) {
-            activeElement = activeElement.shadowRoot.activeElement;
-          }
-          if ($(activeElement).is(":input,[contenteditable]")) {
-            return;
+
+          if (activeElement) {
+            // go deeper if element is a webcomponent
+            while (activeElement.shadowRoot) {
+              activeElement = activeElement.shadowRoot.activeElement;
+            }
+            if ($(activeElement).is(":input,[contenteditable]")) {
+              return;
+            }
           }
 
           var deltaX = 0;