Thread:Extension talk:PDFEmbed/Error if not declaring width and height

Hi, I've just installed this very interesting extension using the default values and config but i have a problem: if I leave all as default, when I save the page in which I have embedded a PDF using  File:name.pdf , I get this error message at the top of the page: Notice: Undefined index: height in C:\wamp\www\kb\extensions\PDFEmbed\PDFEmbed.hooks.php on line 66. However I can see the PDF embedded into the page

The error disappear if I use File:name.pdf 

I tried to explicit the WIDTH and HEIGHT parameters in the config.php but without any success.

I use mediawiki 1.19