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Problem with Print button on CMS page


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Hi solvers, I have problem with putting a "Print button" on my CMS-pages. I get the error Property CMS->content is not valid at line 878 in file classes/ObjectModel.php

and at line 878 it says, 

877.                         throw new PrestaShopException($message);
878.                     return $error_return ? $message : false;


Funny thing is that, if I try it before saving, it works fine, but then, when I save the code I get the message.


The code I use is very simple.



Some text ......
<input type="button" id='winBtn' value="Print" onclick="window.print()">


I use Prestashop version:


And yes I have click "Accept Iframes".


Anyone who have a solution on this?

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