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This:

function aiProcessMessage(event) {
var jsObject = JSON.parse(event.data);

is giving an error because event.data is already a JSON object and not a JSON string.

So, this fixes the error

function aiProcessMessage(event) {
var jsObject = event.data;

But who is sending this? My implementation ai_external.js does send a json string. So this does need the json.parse.

Where does this object come from? Is there a different message sent from the iframe?
Can you enable post message debug and check the output in the js console?

Best Michael

see: http://www.tinywebgallery.com/blog/advanced-iframe/advanced-iframe-pro-demo/external-workaround-with-post-message

There you can see in the Javascript console that this is fine.

So the question is where does this json object come from...

Best, Michael