Error 502 on converting a simple page

Hello, i'm a php developer working for a client of yours.
My problem is as follow: when i try to convert a very simple webpage, from a php script, i alway get a 502 error "Sorry, we can't process your request", but what it bothers me is that for a very complex page in the same project i always get the pdf back. Both pages are using almost the same css + js and the html is correctly formated, i even renounced at tables and replaced them with divs but with no end.
The page where i always get an error is
http://www.esxibackupappliance.com/inventory/public/inventarform.php?customerid=2&objectid=6&expand
and the other one where i have no problem at all is
http://www.esxibackupappliance.com/inventory/public/svitform.php?customerid=2&objectid=6&expand
This error is a show stopper so please provide me a hint on where is the problem.

Thanks, Ciprian

Ciprian,

this looks like a bug on our end. We will investigate this further and come back to you.

Is there any notable difference between the two pages?

Hello sir,
There are not too much differences between pages, both are using de-de lang and utf8 charsets, both are using the same main css file and same js files. The problem appear to be triggered by the items count from <div id="inventoryItems"> because on another page ( http://www.esxibackupappliance.com/inventory/public/inventarform.php?customerid=2&objectid=3&expand ) with less items in this div the conversion is made succesfully.

It looks like there is a glitch on our end which causes the conversion to fail if the box-shadow css property is being applied on a large box. The workaround for your page is to put the following code just before the closing </head> tag:

<style>
  .well { box-shadow: none; -webkit-box-shadow: none; }
</style>

Thank you, now the conversion is working as expected.