diff --git a/inject.js b/inject.js
index fb13754..d059564 100644
--- a/inject.js
+++ b/inject.js
@@ -365,17 +365,17 @@ function getShadow(parent) {
     if (parent.firstElementChild) {
       var child = parent.firstElementChild;
       do {
-        result = result.concat(child);
+        result.push(child);
         getChild(child);
         if (child.shadowRoot) {
-          result = result.concat(getShadow(child.shadowRoot));
+          result.push(getShadow(child.shadowRoot));
         }
         child = child.nextElementSibling;
       } while (child);
     }
   }
   getChild(parent);
-  return result;
+  return result.flat(Infinity);
 }
 function getController(id) {
   return getShadow(document.body).filter(x => {
@@ -502,7 +502,8 @@ function initializeNow(document) {
               });
               break;
             case "attributes":
-              if (mutation.target.attributes["aria-hidden"].value == "false") {
+              if (mutation.target.attributes["aria-hidden"] &&
+                mutation.target.attributes["aria-hidden"].value == "false") {
                 var flattenedNodes = getShadow(document.body);
                 var node = flattenedNodes.filter(x => x.tagName == "VIDEO")[0];
                 if (node) {
diff --git a/manifest.json b/manifest.json
index b911445..021f792 100755
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "name": "Video Speed Controller",
   "short_name": "videospeed",
-  "version": "0.5.9",
+  "version": "0.6.0",
   "manifest_version": 2,
   "description": "Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.",
   "homepage_url": "https://github.com/igrigorik/videospeed",