Creation of cache folders with multiple media-files fails first time

[SpadXIII]

As a test, I grabbed Kohana 3.2 and this kohana-media module (dev 1.2)
I created my own module with just a simple css file and in the application folder I created another simple css file.
In the default welcome controller I called up a view which has minimal html with those 2 css files.

The first request (with empty DOCROOT/media folder) would only load either 1 of those 2 css files, the other has internal server error. It seems to randomly load one but not the other. (re-test: clear media folder and refresh again)

Firebug shows that the error comes from where it creates the cache folder:
https://github.com/Zeelot/kohana-media/blob/dev/1.2.x/classes/controller/media.php#L36-40