Error message

Warning: Creating default object from empty value in _dxcontentbanner_set_details_blog() (line 206 of /appl1/devx/drupal/sites7/all/modules/devx/modules/dxcontentbanner/
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The following code works fine on most browsers but IE has a problem with it. Can you figure it out?

<body onload="addClickHandler()">
<button id="myButton">Click Me</button>

function clickHandler(){

function addClickHandler(){
   myButton = document.getElementById("myButton");
   myButton.onclick = clickHandler;