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5.7.5.6 - Custom package on_start method called by conversation block

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I'm building a custom package to easely add rich snippet and structured markup data to a Concrete5 website.

In the package controller I add this code (for example):
$jsonLDSite = '<script type="application/ld+json">{';
          $jsonLDSite .= '"@context" : "http://schema.org",';
          $jsonLDSite .= '"@type" : "WebSite",';
          $jsonLDSite .= '"name" : "'.$name.'",';
          if(!empty($alternateName)){
            $jsonLDSite .= '"alternateName" : "'.$alternateName.'",';
          }
          $jsonLDSite .= '"url" : "'.$url.'"';
        $jsonLDSite .= '}</script>';
        $view->addFooterItem($jsonLDSite);


Everything works except when I add the Conversation block to the page.
Inside the Conversation block view.php my on_start method is called again and put on the website.

This means the json-ld snippet is added to the page twice.
This is the html output from the conversation block:
<div class="ccm-conversation-wrapper" data-conversation-id="5">
<script type="application/ld+json">
{"@context" : "http://schema.org","@type" : "WebSite","name" : Mywebsite Name","url" : "http://www.mywebsite.com"}
</script>
<h4>Add Message</h4>
// code of the conversation block continues



I've solved this by adding an if-condition to my on_start method, however this might not be the best solution...
// Making sure this is only called once at on_start in the index.php.
    if($_SERVER['CONTEXT_PREFIX'] == DIR_REL.'/index.php'){
        //here the code to add the json-ld to the footer
    }


I've also tried with addHeaderItem instead of the addFooterItem, and both gave the same result.
Anyone else experienced the conversation block adding data through the on_start of a custom package controller ? (my package handle is abc_snippet in case someone wants to try and reproduce)
Jozzeh