diff --git a/post_example.html b/post_example.html
index 0020351..708bfbc 100644
--- a/post_example.html
+++ b/post_example.html
@@ -149,7 +149,14 @@ function openComments(){
 
     while(utterancesLoad==0){
         utterancesFrame=document.getElementsByClassName("utterances-frame")[0];
-        utterancesFrame.onload = function(){utterancesLoad=1;};
+        if(utterancesFrame!=null){
+            if (utterancesFrame.attachEvent){
+                utterancesFrame.attachEvent("onload", function(){utterancesLoad=1;});
+            }
+            else {
+                utterancesFrame.onload = function(){utterancesLoad=1;};
+            }
+        }
     }
     cmButton.style.display="none";
     cm.style.display="block";