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addHeaderItem() seems to render twice when called by on_page_view()

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Hi all

I have a custom block which uses addHeaderItem() in on_page_view(), but it seems to be called twice.

$scripts = '<script type="text/javascript">
      var simple_markers_addresses = [' . $addressesString . '];
      var simple_markers_descriptions = [' . $descriptionsString . ']
      </script>';
      $this->addHeaderItem($scripts);


Gives this:

<script type="text/javascript">
      var simple_markers_addresses = [];
      var simple_markers_descriptions = ["<div><span></span><p><strong><a href='http://'>Website ></a></strong></p></div>"]
      </script>
<script type="text/javascript">
      var simple_markers_addresses = ["actual data"];
      var simple_markers_descriptions = ["actual data"]
      </script>


(obviously 'actual data' is full of the correct stuff, in reality.

I can't see where I'm going wrong. I've tried passing VIEW and CONTROLLER as second arguments to on_page_view(), but no luck.

If I replace the call with a simple string:

$this->addHeaderItem('hello');


it works fine and gives no error.

Can anyone see where I'm going wrong? HTML helper?!
melat0nin