diff --git a/code/utils_misc.js b/code/utils_misc.js
index a8f2048f..dc55c6b4 100644
--- a/code/utils_misc.js
+++ b/code/utils_misc.js
@@ -602,3 +602,12 @@ window.clampLatLng = function(latlng) {
 window.clampLatLngBounds = function(bounds) {
   return new L.LatLngBounds ( clampLatLng(bounds.getSouthWest()), clampLatLng(bounds.getNorthEast()) );
 }
+
+// avoid error in stock JS
+if(goog && goog.style) {
+  goog.style.showElement = function(a, b) {
+    if(a && a.style)
+      a.style.display = b ? "" : "none"
+  };
+}
+
diff --git a/main.js b/main.js
index 72f96f7e..4e5a6ebf 100644
--- a/main.js
+++ b/main.js
@@ -100,7 +100,9 @@ document.getElementsByTagName('body')[0].innerHTML = ''
   + '    </div>'
   + '  </div>'
   + '</div>'
-  + '<div id="updatestatus"><div id="innerstatus"></div></div>';
+  + '<div id="updatestatus"><div id="innerstatus"></div></div>'
+  // avoid error by stock JS
+  + '<div id="play_button"></div>';
 
 // putting everything in a wrapper function that in turn is placed in a
 // script tag on the website allows us to execute in the site’s context
diff --git a/style.css b/style.css
index 3b886151..d32df69c 100644
--- a/style.css
+++ b/style.css
@@ -969,3 +969,8 @@ td + td {
 .portal_details tr.padding-top th, .portal_details tr.padding-top td {
   padding-top: 0.7em;
 }
+
+#play_button {
+  display: none;
+}
+